man > SMARTD.CONF(5)

SMARTD.CONF(5)                         SMART Monitoring Tools                         SMARTD.CONF(5)



NAME
       smartd.conf - SMART Disk Monitoring Daemon Configuration File


DESCRIPTION
       [This man page is generated for the Linux version of smartmontools.  It does not contain info
       specific to other platforms.]

       /etc/smartd.conf is the configuration file for the smartd daemon.

       If the configuration file /etc/smartd.conf is present, smartd reads it at startup.  If smartd
       subsequently  receives  a HUP signal, it will then re-read the configuration file.  If smartd
       is running in debug mode, then an INT signal will also  make  it  re-read  the  configuration
       file.  This signal can be generated by typing <CONTROL-C> in the terminal window where smartd
       is running.

       In the absence of a configuration file smartd will try to open  all  available  devices  (see
       smartd(8)  man page).  A configuration file with a single line 'DEVICESCAN -a' would have the
       same effect.

       This can be annoying if you have an ATA or SCSI device that hangs or misbehaves when  receiv‐
       ing SMART commands.  Even if this causes no problems, you may be annoyed by the string of er‐
       ror log messages about devices that can't be opened.

       One can avoid this problem, and gain more control over  the  types  of  events  monitored  by
       smartd,  by  using the configuration file /etc/smartd.conf.  This file contains a list of de‐
       vices to monitor, with one device per line.  An example file is included with  the  smartmon‐‐
       tools distribution.  You will find this sample configuration file in /usr/share/doc/smartmon‐‐
       tools/.  For security, the configuration file should not be writable by anyone but root.  The
       syntax of the file is as follows:

       •   There should be one device listed per line, although you may have lines that are entirely
           comments or white space.

       •   Any text following a hash sign '#' and up to the end of the line is taken to  be  a  com‐
           ment, and ignored.

       •   Lines may be continued by using a backslash '\' as the last non-whitespace or non-comment
           item on a line.

       •   Note: a line whose first character is a hash sign '#' is treated as a  white-space  blank
           line, not as a non-existent line, and will end a continuation line.

       Here  is  an  example  configuration file.  It's for illustrative purposes only; please don't
       copy it onto your system without reading to the end of the DIRECTIVES Section below!

       ################################################
       # This is an example smartd startup config file
       # /etc/smartd.conf
       #
       # On the second disk, start a long self-test every
       # Sunday between 3 and 4 am.
       #
       /dev/sda -a -m admin AT example.com,root@localhost
       /dev/sdb -a -I 194 -I 5 -i 12 -s L/../../7/03
       #
       # Send a TEST warning email to admin on startup.
       #
       /dev/sdc -m admin AT example.com -M test
       #
       # Strange device.  It's SCSI.  Start a scheduled
       # long self test between 5 and 6 am Monday/Thursday
       /dev/weird -d scsi -s L/../../(1|4)/05
       #
       # An ATA disk may appear as a SCSI device to the
       # OS.  If a SCSI to ATA Translation (SAT) layer
       # is between the OS and the device then this can be
       # flagged with the '-d sat' option.  This situation
       # may become common with SATA disks in SAS and FC
       # environments.
       /dev/sda -a -d sat
       #
       # Three disks connected to a MegaRAID controller
       # Start short self-tests daily between 1-2, 2-3, and
       # 3-4 am.
       /dev/sda -d megaraid,0 -a -s S/../.././01
       /dev/sda -d megaraid,1 -a -s S/../.././02
       /dev/sda -d megaraid,2 -a -s S/../.././03
       /dev/bus/0 -d megaraid,2 -a -s S/../.././03
       #
       # Three disks connected to an AacRaid controller
       # Start short self-tests daily between 1-2, 2-3, and
       # 3-4 am.
       /dev/sda -d aacraid,0,0,66 -a -s S/../.././01
       /dev/sda -d aacraid,0,0,67 -a -s S/../.././02
       /dev/sda -d aacraid,0,0,68 -a -s S/../.././03
       #
       # Two SATA (not SAS) disks on a 3ware 9750 controller.
       # Start long self-tests Sundays between midnight and
       # 1 am and 2-3 am
       # under Linux
       /dev/twl0 -d 3ware,0 -a -s L/../../7/00
       /dev/twl0 -d 3ware,1 -a -s L/../../7/02
       #
       # Monitor 2 disks connected to the first HP SmartArray controller which
       # uses the cciss driver. Start long tests on Sunday nights and short
       # self-tests every night and send errors to root
       #  /dev/sda -d cciss,0 -a -s (L/../../7/02|S/../.././02) -m root
       #  /dev/sda -d cciss,1 -a -s (L/../../7/03|S/../.././03) -m root
       #
       # Three SATA disks on a HighPoint RocketRAID controller.
       # Start short self-tests daily between 1-2, 2-3, and
       # 3-4 am.
       # under Linux
       /dev/sde -d hpt,1/1 -a -s S/../.././01
       /dev/sde -d hpt,1/2 -a -s S/../.././02
       /dev/sde -d hpt,1/3 -a -s S/../.././03
       #
       # Two SATA disks connected to a HighPoint RocketRAID
       # via a pmport device.  Start long self-tests Sundays
       # between midnight and 1 am and 2-3 am.
       # under Linux
       /dev/sde -d hpt,1/4/1 -a -s L/../../7/00
       /dev/sde -d hpt,1/4/2 -a -s L/../../7/02
       #
       # Three SATA disks connected to an Areca
       # RAID controller.  Start long self-tests Sundays
       # between midnight and 3 am.
       # under Linux
       /dev/sg2 -d areca,1 -a -s L/../../7/00
       /dev/sg2 -d areca,2 -a -s L/../../7/01
       /dev/sg2 -d areca,3 -a -s L/../../7/02
       #
       # Two SATA disks on an Intelliprop controller.
       # Start short self-tests daily between 1-2, 2-3, and
       # 3-4 am.
       /dev/sde -d intelliprop,0+sat -a -s S/../.././01
       /dev/sde -d intelliprop,1+sat -a -s S/../.././02
       #
       # The following line enables monitoring of the
       # ATA Error Log and the Self-Test Error Log.
       # It also tracks changes in both Prefailure
       # and Usage Attributes, apart from Attributes
       # 9, 194, and 231, and shows  continued lines:
       #
       /dev/sdd -l error \
            -l selftest \
            -t \         # Attributes not tracked:
            -I 194 \     # temperature
            -I 231 \     # also temperature
            -I 9         # power-on hours
       #
       ################################################

       If a cciss controller is used then the corresponding block device (/dev/sd?) must be  listed,
       along with the ´-d cciss,N´ Directive (see below).


       DEVICESCAN
              If a non-comment entry in the configuration file is the text string DEVICESCAN in cap‐
              ital letters, then smartd will ignore any remaining lines in the  configuration  file,
              and will scan for devices.  If DEVICESCAN is not followed by any Directives, then '-a'
              will apply to all devices.

       DEVICESCAN may optionally be followed by Directives that will apply to all devices  that  are
       found in the scan.  For example

         DEVICESCAN -m root AT example.com

       will  scan for all devices, and then monitor them.  It will send one email warning per device
       for any problems that are found.

         DEVICESCAN -H -m root AT example.com

       will do the same, but only monitors the SMART health status of the devices, rather  than  the
       default '-a'.

       Multiple  '-d  TYPE'  options may be specified with DEVICESCAN to combine the scan results of
       more than one TYPE.

       Configuration entries for specific devices may precede the DEVICESCAN entry.  For example

         DEFAULT -m root AT example.com
         /dev/sda -s S/../.././02
         /dev/sdc -d ignore
         DEVICESCAN -s L/../.././02

       will scan for all devices except /dev/sda and /dev/sdc, monitor them, and run a long test be‐
       tween  2–3  am  every morning.  Device /dev/sda will also be monitored, but only a short test
       will be run.  Device /dev/sdc will be ignored.  Warning emails will be sent for all monitored
       devices.

       A device is ignored by DEVICESCAN if a configuration line with the same device name exists.
       [NEW EXPERIMENTAL SMARTD FEATURE] Symbolic links are resolved before this check is done.

       A  device  name  is  also  ignored  if another device with same identify information (vendor,
       model, firmware version, serial number, WWN) already exists.


DEFAULT SETTINGS
       If an entry in the configuration file starts with DEFAULT instead of a device name, then  all
       directives in this entry are set as defaults for the next device entries.

       This configuration:

         DEFAULT -a -R5! -W 2,40,45 -I 194 -s L/../../7/00 -m admin AT example.com
         /dev/sda
         /dev/sdb
         /dev/sdc
         DEFAULT -H -m admin AT example.com
         /dev/sdd
         /dev/sde -d removable

       has the same effect as:

         /dev/sda -a -R5! -W 2,40,45 -I 194 -s L/../../7/00 -m admin AT example.com
         /dev/sdb -a -R5! -W 2,40,45 -I 194 -s L/../../7/00 -m admin AT example.com
         /dev/sdc -a -R5! -W 2,40,45 -I 194 -s L/../../7/00 -m admin AT example.com
         /dev/sdd -H -m admin AT example.com
         /dev/sde -d removable -H -m admin AT example.com


CONFIGURATION FILE DIRECTIVES
       The  following  are the Directives that may appear following the device name or DEVICESCAN or
       DEFAULT on any line of the /etc/smartd.conf configuration file.  Note that these are NOT com‐‐
       mand-line  options  for  smartd.  The Directives below may appear in any order, following the
       device name.

       For an ATA device, if no Directives appear, then the device will be monitored as if the  '-a'
       Directive (monitor all SMART properties) had been given.

       If  a  SCSI  disk  is  listed, it will be monitored at the maximum implemented level: roughly
       equivalent to using the '-H -l selftest' options for an ATA disk.  So with the  exception  of
       '-d',  '-m',  '-l selftest', '-s', and '-M', the Directives below are ignored for SCSI disks.
       For SCSI disks, the '-m' Directive sends a warning email if the SMART status indicates a disk
       failure  or  problem, if the SCSI inquiry about disk status fails, or if new errors appear in
       the self-test log.

       If a 3ware controller is used then the corresponding  SCSI  (/dev/sd?)  or  character  device
       (/dev/twe?,  /dev/twa?,  /dev/twl?  or /dev/tws?) must be listed, along with the '-d 3ware,N'
       Directive (see below).  The individual ATA disks hosted by the  3ware  controller  appear  to
       smartd  as normal ATA devices.  Hence all the ATA directives can be used for these disks (but
       see note below).

       If an Areca controller is used then the corresponding  device  (SCSI  /dev/sg?  on  Linux  or
       /dev/arcmsr0  on  FreeBSD) must be listed, along with the '-d areca,N' Directive (see below).
       The individual SATA disks hosted by the Areca controller appear to smartd as normal  ATA  de‐
       vices.   Hence  all  the  ATA directives can be used for these disks.  Areca firmware version
       1.46 or later which supports smartmontools must be used; Please see the smartctl(8) man  page
       for further details.

       -d TYPE
              Specifies the type of the device.  The valid arguments to this directive are:

              auto  -  attempt to guess the device type from the device name or from controller type
              info provided by the operating system or from a matching USB ID  entry  in  the  drive
              database.  This is the default.

              ata  -  the device type is ATA.  This prevents smartd from issuing SCSI commands to an
              ATA device.

              scsi - the device type is SCSI.  This prevents smartd from issuing ATA commands  to  a
              SCSI device.

              nvme[,NSID]  -  the  device  type  is NVM Express (NVMe).  The optional parameter NSID
              specifies the namespace id (in hex) passed to the  driver.   Use  0xffffffff  for  the
              broadcast namespace id.  The default for NSID is the namespace id addressed by the de‐
              vice name.

              sat[,auto][,N] - the device type is SCSI to ATA Translation (SAT).  This  is  for  ATA
              disks  that have a SCSI to ATA Translation Layer (SATL) between the disk and the oper‐
              ating system.  SAT defines two ATA PASS THROUGH SCSI commands, one 12 bytes  long  and
              the  other  16 bytes long.  The default is the 16 byte variant which can be overridden
              with either '-d sat,12' or '-d sat,16'.

              If '-d sat,auto' is specified, device type SAT (for ATA/SATA disks) is  only  used  if
              the SCSI INQUIRY data reports a SATL (VENDOR: "ATA     ").  Otherwise device type SCSI
              (for SCSI/SAS disks) is used.

              usbcypress - this device type is for ATA disks that are behind a Cypress USB  to  PATA
              bridge.   This  will use the ATACB proprietary scsi pass through command.  The default
              SCSI operation code is 0x24, but  although  it  can  be  overridden  with  '-d  usbcy‐
              press,0xN',  where  N is the scsi operation code, you're running the risk of damage to
              the device or filesystems on it.

              usbjmicron[,p][,x][,PORT] - this device type is for SATA disks that are behind a  JMi‐
              cron USB to PATA/SATA bridge.  The 48-bit ATA commands (required e.g. for '-l xerror',
              see below) do not work with all of these bridges and are  therefore  disabled  by  de‐
              fault.   These  commands  can  be enabled by '-d usbjmicron,x'.  If two disks are con‐
              nected to a bridge with two ports, an error message is printed if no  PORT  is  speci‐
              fied.   The port can be specified by '-d usbjmicron[,x],PORT' where PORT is 0 (master)
              or 1 (slave).  This is not necessary if the device uses a port multiplier  to  connect
              multiple  disks  to  one  port.   The disks appear under separate /dev/ice names then.
              CAUTION: Specifying ',x' for a device which does not support it results in I/O  errors
              and  may  disconnect the drive.  The same applies if the specified PORT does not exist
              or is not connected to a disk.

              The Prolific PL2507/3507 USB bridges with older firmware support a  pass-through  com‐
              mand  similar to JMicron and work with '-d usbjmicron,0'.  Newer Prolific firmware re‐
              quires a modified command which can be selected by '-d usbjmicron,p'.  Note that  this
              does not yet support the SMART status command.

              usbprolific  -  this  device  type  is  for  SATA  disks  that  are  behind a Prolific
              PL2571/2771/2773/2775 USB to SATA bridge.

              usbsunplus - this device type is for SATA disks that are behind  a  SunplusIT  USB  to
              SATA bridge.

              sntjmicron[,NSID]  -  this device type is for NVMe disks that are behind a JMicron USB
              to NVMe bridge.  The optional parameter NSID  specifies  the  namespace  id  (in  hex)
              passed  to  the  driver.   The  default  namespace  id  is  the broadcast namespace id
              (0xffffffff).

              sntrealtek - [NEW EXPERIMENTAL SMARTD FEATURE] this device type is for NVMe disks that
              are behind a Realtek USB to NVMe bridge.

              marvell  -  [Linux  only] interact with SATA disks behind Marvell chip-set controllers
              (using the Marvell rather than libata driver).

              megaraid,N - [Linux only] the device consists of one or more SCSI/SAS disks  connected
              to a MegaRAID controller.  The non-negative integer N (in the range of 0 to 127 inclu‐
              sive) denotes which disk on the controller is monitored.   This  interface  will  also
              work  for  Dell  PERC  controllers.  In log files and email messages this disk will be
              identified as megaraid_disk_XXX with XXX in the range from 000 to 127  inclusive.   It
              is  possible  to  set  RAID  device  name as /dev/bus/N, where N is a SCSI bus number.
              Please see the smartctl(8) man page for further details.

              aacraid,H,L,ID - [Linux, Windows and Cygwin only] the device consists of one  or  more
              SCSI/SAS  or SATA disks connected to an AacRaid controller.  The non-negative integers
              H,L,ID (Host number, Lun, ID) denote which disk on the controller  is  monitored.   In
              log  files  and  email messages this disk will be identified as aacraid_disk_HH_LL_ID.
              Please see the smartctl(8) man page for further details.

              3ware,N - [FreeBSD and Linux only] the device consists of one or more ATA  disks  con‐
              nected to a 3ware RAID controller.  The non-negative integer N (in the range from 0 to
              127 inclusive) denotes which disk on the controller is monitored.  In  log  files  and
              email  messages  this  disk will be identified as 3ware_disk_XXX with XXX in the range
              from 000 to 127 inclusive.

              Note that while you may use any of the 3ware SCSI logical devices /dev/tw* to  address
              any  of  the  physical  disks (3ware ports), error and log messages will make the most
              sense if you always list the 3ware SCSI logical device corresponding to the particular
              physical disks.  Please see the smartctl(8) man page for further details.

              areca,N - [FreeBSD, Linux, Windows and Cygwin only] the device consists of one or more
              SATA disks connected to an Areca SATA RAID controller.  The positive integer N (in the
              range  from  1 to 24 inclusive) denotes which disk on the controller is monitored.  In
              log files and email messages this disk will be identified as areca_disk_XX with XX  in
              the  range  from  01 to 24 inclusive.  Please see the smartctl(8) man page for further
              details.

              areca,N/E - [FreeBSD, Linux, Windows and Cygwin only] the device consists  of  one  or
              more  SATA  or  SAS  disks  connected  to an Areca SAS RAID controller.  The integer N
              (range 1 to 128) denotes the channel (slot) and E (range 1 to 8)  denotes  the  enclo‐
              sure.  Important: This requires Areca SAS controller firmware version 1.51 or later.

              cciss,N - [FreeBSD and Linux only] the device consists of one or more SCSI/SAS or SATA
              disks connected to a cciss RAID controller.  The non-negative integer N (in the  range
              from  0  to  15  inclusive) denotes which disk on the controller is monitored.  In log
              files and email messages this disk will be identified as cciss_disk_XX with XX in  the
              range  from  00  to 15 inclusive.  Please see the smartctl(8) man page for further de‐
              tails.

              hpt,L/M/N - [FreeBSD and Linux only] the device consists of one or more ATA disks con‐
              nected  to a HighPoint RocketRAID controller.  The integer L is the controller id, the
              integer M is the channel number, and the integer N is  the  PMPort  number  if  it  is
              available.  The allowed values of L are from 1 to 4 inclusive, M are from 1 to 128 in‐
              clusive and N from 1 to 4 if PMPort available.  And also these values are  limited  by
              the  model  of  the  HighPoint RocketRAID controller.  In log files and email messages
              this disk will be identified as hpt_X/X/X and X/X/X is the same as L/M/N, note if no N
              indicated, N set to the default value 1.  Please see the smartctl(8) man page for fur‐
              ther details.

              intelliprop,N[+TYPE] - the device consists of multiple ATA disks connected to  an  In‐
              telliprop  controller.   The integer N is the port number from 0 to 3 of the ATA drive
              to be targeted.  Please see the smartctl(8) man page for further details.

              jmb39x[-q],N[,sLBA][,force][+TYPE] - [NEW EXPERIMENTAL SMARTD FEATURE] the device con‐
              sists  of multiple SATA disks connected to a JMicron JMB39x RAID port multiplier.  The
              suffix '-q' selects a slightly different command variant used by  some  QNAP  NAS  de‐
              vices.   The integer N is the port number from 0 to 4.  Please see the smartctl(8) man
              page for further details.

              jms56x,N[,sLBA][,force][+TYPE] - [NEW EXPERIMENTAL SMARTD FEATURE] the device consists
              of  multiple  SATA  disks  connected to a JMicron JMS56x USB to SATA RAID bridge.  See
              'jmb39x...' above for valid arguments.

              ignore - the device specified by this configuration entry should be ignored.  This al‐
              lows  to ignore specific devices which are detected by a following DEVICESCAN configu‐
              ration line.  It may also be used to temporary disable longer multi-line configuration
              entries.  This Directive may be used in conjunction with the other '-d' Directives.

              removable  -  the  device or its media is removable.  This indicates to smartd that it
              should continue (instead of exiting, which is the default behavior) if the device does
              not appear to be present when smartd is started.  This directive also suppresses warn‐
              ing emails and repeated log messages if the device is removed after startup.  This Di‐
              rective may be used in conjunction with the other '-d' Directives.
              WARNING:  Removing  a  device  and connecting a different one to same interface is not
              supported and may result in bogus warnings until smartd is restarted.

       -n POWERMODE[,N][,q]
              [ATA only] This 'nocheck' Directive is used to prevent a disk from being spun-up  when
              it is periodically polled by smartd.

              ATA  disks have five different power states.  In order of increasing power consumption
              they are: 'OFF', 'SLEEP', 'STANDBY', 'IDLE', and  'ACTIVE'.   Typically  in  the  OFF,
              SLEEP,  and  STANDBY  modes the disk's platters are not spinning.  But usually, in re‐
              sponse to SMART commands issued by smartd, the disk platters are spun up.  So if  this
              option  is  not  used, then a disk which is in a low-power mode may be spun up and put
              into a higher-power mode when it is periodically polled by smartd.

              Note that if the disk is in SLEEP mode when smartd is started, then it  won't  respond
              to smartd commands, and so the disk won't be registered as a device for smartd to mon‐
              itor.  If a disk is in any other low-power mode, then the commands issued by smartd to
              register the disk will probably cause it to spin-up.

              The  '-n'  (nocheck)  Directive  specifies if smartd's periodic checks should still be
              carried out when the device is in a low-power mode.  It may be used to prevent a  disk
              from being spun-up by periodic smartd polling.  The allowed values of POWERMODE are:

              never  -  smartd  will poll (check) the device regardless of its power mode.  This may
              cause a disk which is spun-down to be spun-up when smartd checks it.  This is the  de‐
              fault behavior if the '-n' Directive is not given.

              sleep - check the device unless it is in SLEEP mode.

              standby - check the device unless it is in SLEEP or STANDBY mode.  In these modes most
              disks are not spinning, so if you want to prevent a laptop disk from spinning up  each
              time that smartd polls, this is probably what you want.

              idle  -  check  the  device  unless it is in SLEEP, STANDBY or IDLE mode.  In the IDLE
              state, most disks are still spinning, so this is probably not what you want.

              Maximum number of skipped checks (in a row) can be  specified  by  appending  positive
              number ',N' to POWERMODE (like '-n standby,15').  After N checks are skipped in a row,
              powermode is ignored and the check is performed anyway.

              When a periodic test is skipped, smartd normally writes an informal log message.   The
              message  can  be  suppressed  by  appending  the  option  ',q'  to POWERMODE (like '-n
              standby,q').  This prevents a laptop disk from spinning up due to this message.

              Both ',N' and ',q' can be specified together.

       -T TYPE
              Specifies how tolerant smartd should be of SMART command failures.   The  valid  argu‐
              ments to this Directive are:

              normal  -  do not try to monitor the disk if a mandatory SMART command fails, but con‐
              tinue if an optional SMART command fails.  This is the default.

              permissive - try to monitor the disk even if it appears to  lack  SMART  capabilities.
              This  may  be required for some old disks (prior to ATA-3 revision 4) that implemented
              SMART before the SMART standards were incorporated into the ATA/ATAPI  Specifications.
              [Please see the smartctl -T command-line option.]

       -o VALUE
              [ATA  only]  Enables or disables SMART Automatic Offline Testing when smartd starts up
              and has no further effect.  The valid arguments to this Directive are on and off.

              The delay between tests is vendor-specific, but is typically four hours.

              Note that SMART Automatic Offline Testing  is  not  part  of  the  ATA  Specification.
              Please  see  the smartctl -o command-line option documentation for further information
              about this feature.

       -S VALUE
              Enables or disables Attribute Autosave when smartd starts up and has  no  further  ef‐
              fect.   The  valid  arguments to this Directive are on and off.  Also affects SCSI de‐
              vices.  [Please see the smartctl -S command-line option.]

       -H     [ATA] Check the health status of the disk with the SMART RETURN  STATUS  command.   If
              this  command  reports a failing health status, then disk failure is predicted in less
              than 24 hours, and a message at loglevel 'LOG_CRIT' will be logged to syslog.  [Please
              see the smartctl -H command-line option.]

              [NVMe]  Checks  the "Critical Warning" byte from the SMART/Health Information log.  If
              any warning bit is set, a message at loglevel 'LOG_CRIT' will be logged to syslog.

       -l TYPE
              Reports increases in the number of errors in one of three SMART logs.  The valid argu‐
              ments to this Directive are:

              error  -  [ATA] report if the number of ATA errors reported in the Summary SMART error
              log has increased since the last check.

              error - [NVMe] report if the "Number  of  Error  Information  Log  Entries"  from  the
              SMART/Health Information log has increased since the last check.

              xerror  - [ATA] report if the number of ATA errors reported in the Extended Comprehen‐
              sive SMART error log has increased since the last check.

              If both '-l error' and '-l xerror' are specified, smartd checks the  maximum  of  both
              values.

              [Please see the smartctl -l xerror command-line option.]

              xerror - [NVMe] same as '-l error'.

              selftest  -  report  if the number of failed tests reported in the SMART Self-Test Log
              has increased since the last check, or if the timestamp associated with the  most  re‐
              cent  failed test has increased.  Note that such errors will only be logged if you run
              self-tests on the disk (and it fails a test!).  Self-Tests can be run automatically by
              smartd:  please  see the '-s' Directive below.  Self-Tests can also be run manually by
              using the '-t short' and '-t long' options of smartctl and the results of the  testing
              can be observed using the smartctl '-l selftest' command-line option.  [Please see the
              smartctl -l and -t command-line options.]

              [ATA only] Failed self-tests outdated by a newer successful extended self-test are ig‐
              nored.   The warning email counter is reset if the number of failed self tests dropped
              to 0.  This typically happens when an extended self-test is run after all bad  sectors
              have been reallocated.

              offlinests[,ns]  - [ATA only] report if the Offline Data Collection status has changed
              since the last check.  The report will be logged as LOG_CRIT if the new  status  indi‐
              cates  an error.  With some drives the status often changes, therefore '-l offlinests'
              is not enabled by '-a' Directive.  Appending ',ns' (no standby) to this  directive  is
              not implemented on Linux.

              selfteststs[,ns]  -  [ATA  only]  report if the Self-Test execution status has changed
              since the last check.  The report will be logged as LOG_CRIT if the new  status  indi‐
              cates  an error.  Appending ',ns' (no standby) to this directive is not implemented on
              Linux.

              scterc,READTIME,WRITETIME - [ATA only] sets the SCT Error Recovery Control settings to
              the  specified  values  (deciseconds) when smartd starts up and has no further effect.
              Values of 0 disable the feature, other values less than 65 are probably not supported.
              For  RAID configurations, this is typically set to 70,70 deciseconds.  [Please see the
              smartctl -l scterc command-line option.]

       -e NAME[,VALUE]
              Sets non-SMART device settings when smartd  starts  up  and  has  no  further  effect.
              [Please see the smartctl --set command-line option.]  Valid arguments are:

              aam,[N|off] - [ATA only] Sets the Automatic Acoustic Management (AAM) feature.

              apm,[N|off] - [ATA only] Sets the Advanced Power Management (APM) feature.

              lookahead,[on|off] - [ATA only] Sets the read look-ahead feature.

              security-freeze - [ATA only] Sets ATA Security feature to frozen mode.

              standby,[N|off] - [ATA only] Sets the standby (spindown) timer and places the drive in
              the IDLE mode.

              wcache,[on|off] - [ATA only] Sets the volatile write cache feature.

              dsn,[on|off] - [ATA only] Sets the DSN feature.

       -s REGEXP
              Run Self-Tests or Offline Immediate Tests, at scheduled times.  A Self- or Offline Im‐
              mediate  Test  will be run at the end of periodic device polling, if all 12 characters
              of the string T/MM/DD/d/HH match the extended regular expression REGEXP.  Here:

              T   is the type of the test.  The values that smartd will try to match (in turn)  are:
                  'L'  for  a  Long Self-Test, 'S' for a Short Self-Test, 'C' for a Conveyance Self-
                  Test (ATA only), and 'O' for an Offline Immediate Test (ATA only).  As soon  as  a
                  match  is found, the test will be started and no additional matches will be sought
                  for that device and that polling cycle.

                  To run scheduled Selective Self-Tests, use 'n' for next span,  'r'  to  redo  last
                  span,  or 'c' to continue with next span or redo last span based on status of last
                  test.  The LBA range is based on the first span  from  the  last  test.   See  the
                  smartctl -t select,[next|redo|cont] options for further info.

                  Some  disks (e.g. WD) do not preserve the selective self test log across power cy‐
                  cles.  If state persistence ('-s' option) is enabled, the last test span  is  pre‐
                  served by smartd and used if (and only if) the selective self test log is empty.

              MM  is the month of the year, expressed with two decimal digits.  The range is from 01
                  (January) to 12 (December) inclusive.  Do not use a single decimal  digit  or  the
                  match will always fail!

              DD  is  the day of the month, expressed with two decimal digits.  The range is from 01
                  to 31 inclusive.  Do not use a single decimal digit or the match will always fail!

              d   is the day of the week, expressed with one decimal digit.  The  range  is  from  1
                  (Monday) to 7 (Sunday) inclusive.

              HH  is  the hour of the day, written with two decimal digits, and given in hours after
                  midnight.  The range is 00 (midnight to just before 1 am) to 23 (11pm to just  be‐
                  fore midnight) inclusive.  Do not use a single decimal digit or the match will al‐
                  ways fail!

              [NEW EXPERIMENTAL SMARTD FEATURE] If the regular expression contains substrings of the
              form :NNN or :NNN-LLL, where NNN and LLL are three decimal digits, staggered tests are
              enabled.  Then a test will also be run if all 16 (or  20)  characters  of  the  string
              T/MM/DD/d/HH:NNN  (or  T/MM/DD/d/HH:NNN-LLL) match the regular expression.  This check
              is done for up to seven :NNN or :NNN-LLL found in the regular  expression.   The  time
              used  for the check is adjusted to the past such that tests of the first drive are not
              delayed, tests of the second drive are delayed by NNN hours, tests of the third  drive
              are delayed by 2*NNN hours, and so on.
              If LLL is also specified, delays are limited to LLL hours by calculating each individ‐
              ual delay as:
              '((DRIVE_INDEX * NNN) mod (LLL + 1))'.

              Some examples follow.  In reading these, keep in mind that in extended regular expres‐
              sions  a  dot '.' matches any single character, and a parenthetical expression such as
              '(A|B|C)' denotes any one of the three possibilities A, B, or C.

              To schedule a short Self-Test between 2–3 am every morning, use:
               -s S/../.././02
              To schedule a long Self-Test between 4–5 am every Sunday morning, use:
               -s L/../../7/04
              To enable staggered tests with delays in three hour steps, use:
               -s L/../../7/04:003
              To enable staggered tests with delays 0, 3, 6, 9, 1, 4, 7, 10, 2, 5, 8, 0, ...  hours,
              use:
               -s L/../../7/04:003-010
              To enable staggered tests with delays 0, 1, 2, ..., 9, 10, 0, ... hours, use:
               -s L/../../7/04:001-010
              To  schedule  a long Self-Test between 10–11 pm on the first and fifteenth day of each
              month, use:
               -s L/../(01|15)/./22
              To schedule an Offline Immediate test after every midnight, 6 am, noon, and 6 pm, plus
              a Short Self-Test daily at 1–2 am and a Long Self-Test every Saturday at 3–4 am, use:
               -s (O/../.././(00|06|12|18)|S/../.././01|L/../../6/03)
              To enable staggered Long Self-Tests with delays in three hour steps, use:
               -s (O/../.././(00|06|12|18)|S/../.././01|L/../../6/03:003)
              If  Long  Self-Tests  of a large disks take longer than the system uptime, a full disk
              test can be performed by several Selective Self-Tests.  To setup a full test of a 1 TB
              disk within 20 days (one 50 GB span each day), run this command once:
                smartctl -t select,0-99999999 /dev/sda
              To run the next test spans on Monday–Friday between 12–13 am, run smartd with this di‐
              rective:
               -s n/../../[1-5]/12

              Scheduled tests are run immediately following the regularly-scheduled device  polling,
              if  the  current  local date, time, and test type, match REGEXP.  By default the regu‐
              larly-scheduled device polling occurs every  thirty  minutes  after  starting  smartd.
              Take  caution if you use the '-i' option to make this polling interval more than sixty
              minutes: the poll times may fail to coincide with any of the testing  times  that  you
              have  specified with REGEXP.  In this case the test will be run following the next de‐
              vice polling.

              Before running an offline or self-test, smartd checks to be sure that a  self-test  is
              not  already  running.  If a self-test is already running, then this running self test
              will not be interrupted to begin another test.

              smartd will not attempt to run any type of test if another test was already started or
              run in the same hour.

              To  avoid  performance problems during system boot, smartd will not attempt to run any
              scheduled tests following the very first device polling (unless '-q onecheck' is spec‐
              ified).

              Each time a test is run, smartd will log an entry to SYSLOG.  You can use these or the
              '-q showtests' command-line option to verify that you  constructed  REGEXP  correctly.
              The  matching order (L before S before C before O) ensures that if multiple test types
              are all scheduled for the same hour, the longer test type  has  precedence.   This  is
              usually the desired behavior.

              If  the  scheduled tests are used in conjunction with state persistence ('-s' option),
              smartd will also try to match the hours since last shutdown (or 90 days at most).   If
              any  test  would  have  been started during downtime, the longest (see above) of these
              tests is run after second device polling.

              If the '-n' directive is used and any test would have been started during disk standby
              time, the longest of these tests is run when the disk is active again.

              Unix  users:  please beware that the rules for extended regular expressions [regex(7)]
              are not the same as the rules for file-name pattern matching by the  shell  [glob(7)].
              smartd  will issue harmless informational warning messages if it detects characters in
              REGEXP that appear to indicate that you have made this mistake.

       -m ADD Send a warning email to the email address ADD if the '-H', '-l  error',  '-l  xerror',
              '-l  selftest',  '-f', '-C', '-U', or '-W' Directives detect a failure or a new error,
              or if a SMART command to the disk fails.  This Directive  only  works  in  conjunction
              with these other Directives (or with the equivalent default '-a' Directive).

              To  prevent your email in-box from getting filled up with warning messages, by default
              only a single warning and (depending on '-s' option) daily  reminder  emails  will  be
              sent for each of the enabled alert types.  See the '-M' Directive below for details.

              To  send  email to more than one user, please use the following "comma separated" form
              for the address: user1@add1,user2@add2,...,userN@addN (with no spaces).

              To test that email is being sent correctly, use the '-M test' Directive described  be‐
              low to send one test email message on smartd startup.

              By default, email is sent using the system mail(1) command.  In order that smartd find
              this command (normally /usr/bin/mail) the executable must be in the path of the  shell
              or environment from which smartd was started.  If you wish to specify an explicit path
              to the mail executable (for example /usr/local/bin/mail) or a custom  script  to  run,
              please use the '-M exec' Directive below.

              Note  also  that there is a special argument <nomailer> which can be given to the '-m'
              Directive in conjunction with the '-M exec' Directive.  Please see below for an expla‐
              nation of its effect.

              If  the mailer or the shell running it produces any STDERR/STDOUT output, then a snip‐
              pet of that output will be copied to SYSLOG.  The remainder  of  the  output  is  dis‐
              carded.   If  problems are encountered in sending mail, this should help you to under‐
              stand and fix them.  If you have mail problems, we recommend running smartd  in  debug
              mode with the '-d' flag, using the '-M test' Directive described below.

              If  a  word  of  the  comma  separated  list  has  the form '@plugin', a custom script
              /etc/smartmontools/smartd_warning.d/plugin is run and the word  is  removed  from  the
              list before sending mail.  The string 'plugin' may be any valid name except 'ALL'.  If
              '@ALL' is specified, all scripts in /etc/smartmontools/smartd_warning.d/* are run  in‐
              stead.   This is handled by the script /usr/share/smartmontools/smartd_warning.sh (see
              also '-M exec' below).

       -M TYPE
              These Directives modify the behavior of the smartd email  warnings  enabled  with  the
              '-m'  email Directive described above.  These '-M' Directives only work in conjunction
              with the '-m' Directive and can not be used without it.

              Multiple -M Directives may be given.  If more than one of the following three  -M  Di‐
              rectives  are given (example: -M once -M daily) then the final one (in the example, -M
              daily) is used.

              The valid arguments to the -M Directive are (one of the following three):

              once - send only one warning email for each type of disk problem  detected.   This  is
              the default unless state persistence ('-s' option) is enabled.

              daily  -  send additional warning reminder emails, once per day, for each type of disk
              problem detected.  This is the default if state persistence ('-s' option) is enabled.

              diminishing - send additional warning reminder emails, after a one-day interval,  then
              a  two-day interval, then a four-day interval, and so on for each type of disk problem
              detected.  Each interval is twice as long as the previous interval.

              If a disk problem is no longer detected, the internal email counter is reset.  If  the
              problem reappears a new warning email is sent immediately.

              In addition, one may add zero or more of the following Directives:

              test  -  send a single test email immediately upon smartd startup.  This allows one to
              verify that email is delivered correctly.  Note that if this Directive is used, smartd
              will also send the normal email warnings that were enabled with the '-m' Directive, in
              addition to the single test email!

              exec PATH - run the executable PATH instead of the default mail command,  when  smartd
              needs to send email.  PATH must point to an executable binary file or script.

              By  setting  PATH  to point to a customized script, you can make smartd perform useful
              tricks when a disk problem is detected (beeping the console,  shutting  down  the  ma‐
              chine,  broadcasting  warnings  to  all logged-in users, etc.)  But please be careful.
              smartd will block until the executable PATH returns, so if your executable hangs, then
              smartd  will  also hang.  Some sample scripts are included in /usr/share/doc/smartmon‐
              tools/examples//.

              The exit status of the executable is recorded by smartd in SYSLOG.  The executable  is
              not  expected  to  write to STDOUT or STDERR.  If it does, then this is interpreted as
              indicating that something is going wrong with your executable, and a fragment of  this
              output  is  logged  to SYSLOG to help you to understand the problem.  Normally, if you
              wish to leave some record behind, the executable should send mail or write to  a  file
              or device.

              Before  running  the executable, smartd sets a number of environment variables.  These
              environment variables may be used to control the executable's behavior.  The  environ‐
              ment variables exported by smartd are:

              SMARTD_MAILER
                  is  set  to  the  argument  of  -M  exec,  if present or else to 'mail' (examples:
                  /usr/local/bin/mail, mail).

              SMARTD_DEVICE
                  is set to the device path (example: /dev/sda).

              SMARTD_DEVICETYPE
                  is set to the device type specified by '-d' directive or 'auto' if none.

              SMARTD_DEVICESTRING
                  is set to the device description.  It starts with SMARTD_DEVICE and  may  be  fol‐
                  lowed  by  an  optional  controller identification (example: /dev/sda [SAT]).  The
                  string may contain a space and is NOT quoted.

              SMARTD_DEVICEINFO
                  is set to device identify information.  It includes most of the  info  printed  by
                  smartctl  -i but uses a brief single line format.  This device info is also logged
                  when smartd starts up.  The string contains space characters and is NOT quoted.

              SMARTD_FAILTYPE
                  gives the reason for the warning or message email.  The possible  values  that  it
                  takes and their meanings are:
                  EmailTest: this is an email test message.
                  Health: the SMART health status indicates imminent failure.
                  Usage: a usage Attribute has failed.
                  SelfTest: the number of self-test failures has increased.
                  ErrorCount: the number of errors in the ATA error log has increased.
                  CurrentPendingSector: one of more disk sectors could not be read and are marked to
                  be reallocated (replaced with spare sectors).
                  OfflineUncorrectableSector: during off-line testing, or self-testing, one or  more
                  disk sectors could not be read.
                  Temperature: Temperature reached critical limit (see -W directive).
                  FailedHealthCheck: the SMART health status command failed.
                  FailedReadSmartData: the command to read SMART Attribute data failed.
                  FailedReadSmartErrorLog: the command to read the SMART error log failed.
                  FailedReadSmartSelfTestLog: the command to read the SMART self-test log failed.
                  FailedOpenDevice: the open() command to the device failed.

              SMARTD_ADDRESS
                  is  determined  by the address argument ADD of the '-m' Directive.  If ADD is <no‐‐
                  mailer>, then SMARTD_ADDRESS is not set.  Otherwise, it is set to the  comma-sepa‐
                  rated-list  of email addresses given by the argument ADD, with the commas replaced
                  by spaces (example:admin AT example.com root).  If more than  one  email  address  is
                  given, then this string will contain space characters and is NOT quoted, so to use
                  it in a shell script you may want to enclose it in double quotes.

              SMARTD_MESSAGE
                  is set to the one sentence summary warning email message string from smartd.  This
                  message   string  contains  space  characters  and  is  NOT  quoted.   So  to  use
                  $SMARTD_MESSAGE in a shell script you should probably enclose it in double quotes.

              SMARTD_FULLMESSAGE
                  is set to the contents of the entire email warning  message  string  from  smartd.
                  This message string contains space and return characters and is NOT quoted.  So to
                  use $SMARTD_FULLMESSAGE in a shell script you should probably enclose it in double
                  quotes.

              SMARTD_TFIRST
                  is  a text string giving the time and date at which the first problem of this type
                  was reported.  This text string contains space characters and no newlines, and  is
                  NOT quoted.  For example:
                  Sun Feb  9 14:58:19 2003 CST

              SMARTD_TFIRSTEPOCH
                  is  an  integer, which is the unix epoch (number of seconds since Jan 1, 1970) for
                  SMARTD_TFIRST.

              SMARTD_PREVCNT
                  is an integer specifying the number of previous messages sent.  It is set  to  '0'
                  for the first message.

              SMARTD_NEXTDAYS
                  is  an  integer specifying the number of days until the next message will be sent.
                  It it set to empty on '-M once' and set to '1' on '-M daily'.

              If the '-m ADD' Directive is given with a normal address argument, then the executable
              pointed  to  by PATH will be run in a shell with STDIN receiving the body of the email
              message, and with the same command-line arguments:
                -s "$SMARTD_SUBJECT" $SMARTD_ADDRESS
              that would normally be provided to 'mail'.  Examples include:
              -m user@home -M exec /usr/bin/mail
              -m admin@work -M exec /usr/local/bin/mailto
              -m root -M exec /Example_1/shell/script/below

              If the '-m ADD' Directive is given with the special address argument  <nomailer>  then
              the  executable pointed to by PATH is run in a shell with no STDIN and no command-line
              arguments, for example:
                -m <nomailer> -M exec /Example_2/shell/script/below

              If the executable produces any STDERR/STDOUT output, then smartd  assumes  that  some‐
              thing  is going wrong, and a snippet of that output will be copied to SYSLOG.  The re‐
              mainder of the output is then discarded.

              Some EXAMPLES of scripts that can be used with the '-M exec' Directive are  given  be‐
              low.   Some  sample  scripts  are  also included in /usr/share/doc/smartmontools/exam‐
              ples//.

              The executable is run by the script /usr/share/smartmontools/smartd_warning.sh.   This
              script  formats subject and full message based on SMARTD_MESSAGE and other environment
              variables set by smartd.  The environment variables SMARTD_SUBJECT and SMARTD_FULLMES‐
              SAGE are set by the script before running the executable.

       -f     [ATA  only] Check for 'failure' of any Usage Attributes.  If these Attributes are less
              than or equal to the threshold, it does NOT indicate imminent disk failure.  It "indi‐
              cates  an advisory condition where the usage or age of the device has exceeded its in‐
              tended design life period."  [Please see the smartctl -A command-line option.]

       -p     [ATA only] Report anytime that a Prefail Attribute has changed  its  value  since  the
              last check.  [Please see the smartctl -A command-line option.]

       -u     [ATA  only] Report anytime that a Usage Attribute has changed its value since the last
              check.  [Please see the smartctl -A command-line option.]

       -t     [ATA only] Equivalent to turning on the two previous  flags  '-p'  and  '-u'.   Tracks
              changes  in  all  device  Attributes  (both  Prefailure  and  Usage).  [Please see the
              smartctl -A command-line option.]

       -i ID  [ATA only] Ignore device Attribute number ID when checking for failure  of  Usage  At‐
              tributes.   ID  must  be a decimal integer in the range from 1 to 255.  This Directive
              modifies the behavior of the '-f' Directive and has no effect without it.

              This is useful, for example, if you have a very old disk and don't want to  keep  get‐
              ting  messages  about  the  hours-on-lifetime Attribute (usually Attribute 9) failing.
              This Directive may appear multiple times for a single device, if you  want  to  ignore
              multiple Attributes.

       -I ID  [ATA  only]  Ignore device Attribute ID when tracking changes in the Attribute values.
              ID must be a decimal integer in the range from 1 to 255.  This Directive modifies  the
              behavior of the '-p', '-u', and '-t' tracking Directives and has no effect without one
              of them.

              This is useful, for example, if one of the device Attributes is the  disk  temperature
              (usually  Attribute  194 or 231).  It's annoying to get reports each time the tempera‐
              ture changes.  This Directive may appear multiple times for a single  device,  if  you
              want to ignore multiple Attributes.

       -r ID[!]
              [ATA  only]  When  tracking, report the Raw value of Attribute ID along with its (nor‐
              mally reported) Normalized value.  ID must be a decimal integer in the range from 1 to
              255.  This Directive modifies the behavior of the '-p', '-u', and '-t' tracking Direc‐
              tives and has no effect without one of them.  This Directive  may  be  given  multiple
              times.

              A  common  use  of  this Directive is to track the device Temperature (often ID=194 or
              231).

              If the optional flag '!' is appended, a change of the Normalized value  is  considered
              critical.   The  report will be logged as LOG_CRIT and a warning email will be sent if
              '-m' is specified.

       -R ID[!]
              [ATA only] When tracking, report whenever the  Raw  value  of  Attribute  ID  changes.
              (Normally  smartd only tracks/reports changes of the Normalized Attribute values.)  ID
              must be a decimal integer in the range from 1 to 255.  This Directive modifies the be‐
              havior  of  the '-p', '-u', and '-t' tracking Directives and has no effect without one
              of them.  This Directive may be given multiple times.

              If this Directive is given, it automatically implies the '-r' Directive for  the  same
              Attribute, so that the Raw value of the Attribute is reported.

              A  common  use  of  this Directive is to track the device Temperature (often ID=194 or
              231).  It is also useful for understanding how different types of system behavior  af‐
              fects the values of certain Attributes.

              If  the  optional flag '!' is appended, a change of the Raw value is considered criti‐
              cal.  The report will be logged as LOG_CRIT and a warning email will be sent  if  '-m'
              is specified.  An example is '-R 5!' to warn when new sectors are reallocated.

       -C ID[+]
              [ATA  only]  Report  if the current number of pending sectors is non-zero.  Here ID is
              the id number of the Attribute whose raw value is the Current  Pending  Sector  count.
              The  allowed  range  of  ID  is  0  to 255 inclusive.  To turn off this reporting, use
              ID = 0.  If the -C ID option is not given, then it defaults to -C 197 (since Attribute
              197  is  generally used to monitor pending sectors).  If the name of this Attribute is
              changed by a '-v 197,FORMAT,NAME' directive, the default is changed to -C 0.

              If '+' is specified, a report is only printed if the number of sectors  has  increased
              between two check cycles.  Some disks do not reset this attribute when a bad sector is
              reallocated.  See also '-v 197,increasing' below.

              The warning email counter is reset if the number of  pending  sectors  dropped  to  0.
              This typically happens when all pending sectors have been reallocated or could be read
              again.

              A pending sector is a disk sector (containing 512 bytes of your data) which the device
              would  like  to mark as "bad" and reallocate.  Typically this is because your computer
              tried to read that sector, and the read failed because the data on it  has  been  cor‐
              rupted and has inconsistent Error Checking and Correction (ECC) codes.  This is impor‐
              tant to know, because it means that there is some unreadable data on  the  disk.   The
              problem  of  figuring  out what file this data belongs to is operating system and file
              system specific.  You can typically force the sector to reallocate by  writing  to  it
              (translation:  make  the device substitute a spare good sector for the bad one) but at
              the price of losing the 512 bytes of data stored there.

       -U ID[+]
              [ATA only] Report if the number of offline uncorrectable sectors is non-zero.  Here ID
              is  the id number of the Attribute whose raw value is the Offline Uncorrectable Sector
              count.  The allowed range of ID is 0 to 255 inclusive.  To turn  off  this  reporting,
              use  ID = 0.   If the -U ID option is not given, then it defaults to -U 198 (since At‐
              tribute 198 is generally used to monitor offline uncorrectable sectors).  If the  name
              of  this  Attribute  is  changed by a '-v 198,FORMAT,NAME' (except '-v 198,FORMAT,Off‐
              line_Scan_UNC_SectCt'), directive, the default is changed to -U 0.

              If '+' is specified, a report is only printed if the number of sectors  has  increased
              since  the last check cycle.  Some disks do not reset this attribute when a bad sector
              is reallocated.  See also '-v 198,increasing' below.

              The warning email counter is reset if the  number  of  offline  uncorrectable  sectors
              dropped to 0.  This typically happens when all offline uncorrectable sectors have been
              reallocated or could be read again.

              An offline uncorrectable sector is a disk sector which was not readable during an off-
              line  scan or a self-test.  This is important to know, because if you have data stored
              in this disk sector, and you need to read it, the read will fail.  Please see the pre‐
              vious '-C' option for more details.

       -W DIFF[,INFO[,CRIT]]
              Report  if the current temperature had changed by at least DIFF degrees since last re‐
              port, or if new min or max temperature is detected.  Report or Warn if the temperature
              is  greater  or  equal than one of INFO or CRIT degrees Celsius.  If the limit CRIT is
              reached, a message with loglevel 'LOG_CRIT' will be logged to  syslog  and  a  warning
              email will be send if '-m' is specified.  If only the limit INFO is reached, a message
              with loglevel 'LOG_INFO' will be logged.

              The warning email counter is reset if the temperature dropped below INFO or CRIT-5  if
              INFO is not specified.

              If this directive is used in conjunction with state persistence ('-s' option), the min
              and max temperature values are preserved across boot cycles.  The minimum  temperature
              value is not updated during the first 30 minutes after startup.

              To  disable any of the 3 reports, set the corresponding limit to 0.  Trailing zero ar‐
              guments may be omitted.  By default, all temperature reports are disabled ('-W 0').

              To track temperature changes of at least 2 degrees, use:
              -W 2
              To log informal messages on temperatures of at least 40 degrees, use:
              -W 0,40
              For warning messages/mails on temperatures of at least 45 degrees, use:
              -W 0,0,45
              To combine all of the above reports, use:
              -W 2,40,45

              For ATA devices, smartd interprets Attribute 194 or 190 as Temperature Celsius by  de‐
              fault.   This can be changed to Attribute 9 or 220 by the drive database or by the '-v
              9,temp' or '-v 220,temp' directive.

              For NVMe devices, smartd checks the maximum of the Composite Temperature value and all
              Temperature Sensor values reported by SMART/Health Information log.

       -F TYPE
              [ATA only] Modifies the behavior of smartd to compensate for some known and understood
              device firmware bug.  This directive may be used multiple times.  The valid  arguments
              are:

              none  - Assume that the device firmware obeys the ATA specifications.  This is the de‐
              fault, unless the device has presets for '-F' in the drive database.  Using  this  di‐
              rective will override any preset values.

              nologdir  -  Suppresses  read  attempts of SMART or GP Log Directory.  Support for all
              standard logs is assumed without an actual check.  Some Intel SSDs may freeze  if  log
              address 0 is read.

              samsung  -  In  some Samsung disks (example: model SV4012H Firmware Version: RM100-08)
              some of the two- and four-byte quantities in  the  SMART  data  structures  are  byte-
              swapped  (relative  to  the  ATA specification).  Enabling this option tells smartd to
              evaluate these quantities in byte-reversed order.  Some signs  that  your  disk  needs
              this option are (1) no self-test log printed, even though you have run self-tests; (2)
              very large numbers of ATA errors reported in the ATA error log; (3) strange and impos‐
              sible values for the ATA error log timestamps.

              samsung2  -  In  some Samsung disks the number of ATA errors reported is byte swapped.
              Enabling this option tells smartd to evaluate this quantity in byte-reversed order.

              samsung3 - Some Samsung disks (at least SP2514N with Firmware VF100-37) report a self-
              test still in progress with 0% remaining when the test was already completed.  If this
              directive is specified, smartd will not skip the next scheduled self-test (see  Direc‐
              tive '-s' above) in this case.

              xerrorlba - This only affects smartctl.

              [Please see the smartctl -F command-line option.]

       -v ID,FORMAT[:BYTEORDER][,NAME]
              [ATA only] Sets a vendor-specific raw value print FORMAT, an optional BYTEORDER and an
              optional NAME for Attribute ID.  This directive may be used  multiple  times.   Please
              see smartctl -v command-line option for further details.

              The following arguments affect smartd warning output:

              197,increasing  - Raw Attribute number 197 (Current Pending Sector Count) is not reset
              if uncorrectable sectors are reallocated.  This sets '-C 197+' if no other '-C' direc‐
              tive is specified.

              198,increasing  - Raw Attribute number 198 (Offline Uncorrectable Sector Count) is not
              reset if uncorrectable sectors are reallocated.  This sets '-U 198+' if no other  '-U'
              directive is specified.

       -P TYPE
              [ATA  only]  Specifies whether smartd should use any preset options that are available
              for this drive.  The valid arguments to this Directive are:

              use - use any presets that are available for this drive.  This is the default.

              ignore - do not use any presets for this drive.

              show - show the presets listed for this drive in the database.

              showall - show the presets that are available for all drives and then exit.

              [Please see the smartctl -P command-line option.]

       -a     Equivalent to turning on all of the following Directives:  '-H'  to  check  the  SMART
              health status, '-f' to report failures of Usage (rather than Prefail) Attributes, '-t'
              to track changes in both Prefailure and Usage Attributes,  '-l error'  to  report  in‐
              creases  in  the number of ATA errors, '-l selftest' to report increases in the number
              of Self-Test Log errors, '-l selfteststs' to report  changes  of  Self-Test  execution
              status, '-C 197' to report nonzero values of the current pending sector count, and '-U
              198' to report nonzero values of the offline pending sector count.

              Note that -a is the default for ATA devices.  If none of  these  other  Directives  is
              given, then -a is assumed.

       #      Comment: ignore the remainder of the line.

       \      Continuation  character:  if  this is the last non-white or non-comment character on a
              line, then the following line is a continuation of the current one.

       If you are not sure which Directives to use, I suggest experimenting for a few  minutes  with
       smartctl to see what SMART functionality your disk(s) support(s).  If you do not like volumi‐
       nous syslog messages, a good choice of smartd configuration file Directives might be:
       -H -l selftest -l error -f.
       If you want more frequent information, use: -a.


       EXAMPLES OF SHELL SCRIPTS FOR '-M exec'
              These are two examples of shell scripts that can be used with the '-M exec  PATH'  Di‐
              rective  described  previously.  The paths to these scripts and similar executables is
              the PATH argument to the '-M exec PATH' Directive.

              Example 1: This script is for use with '-m ADDRESS -M exec PATH'.  It appends the out‐
              put  of  smartctl -a to the output of the smartd email warning message and sends it to
              ADDRESS.

              #! /bin/sh

              # Save the email message (STDIN) to a file:
              cat > /root/msg

              # Append the output of smartctl -a to the message:
              /usr/sbin/smartctl -a -d $SMART_DEVICETYPE \
                $SMARTD_DEVICE >> /root/msg

              # Now email the message to the user at address ADD:
              /usr/bin/mail -s "$SMARTD_SUBJECT" $SMARTD_ADDRESS \
                < /root/msg

              Example 2: This script is for use with '-m <nomailer> -M exec  PATH'.   It  warns  all
              users about a disk problem, waits 30 seconds, and then powers down the machine.

              #! /bin/sh

              # Warn all users of a problem
              wall <<EOF
              Problem detected with disk: $SMARTD_DEVICESTRING
              Warning message from smartd is: $SMARTD_MESSAGE
              Shutting down machine in 30 seconds...
              EOF

              # Wait half a minute
              sleep 30

              # Power down the machine
              /sbin/shutdown -hf now

              Some   example   scripts   are   distributed   with   the  smartmontools  package,  in
              /usr/share/doc/smartmontools/examples/.

              Please note that these  scripts  typically  run  as  root,  so  any  files  that  they
              read/write should not be writable by ordinary users or reside in directories like /tmp
              that are writable by ordinary users and may expose your system to symlink attacks.

              As previously described, if the scripts write to STDOUT or STDERR, this is interpreted
              as  indicating  that  there  was an internal error within the script, and a snippet of
              STDOUT/STDERR is logged to SYSLOG.  The remainder is flushed.


FILES
       /etc/smartd.conf
              full path of this file.


SEE ALSO
       smartd(8), smartctl(8), mail(1), regex(7).


PACKAGE VERSION
       smartmontools-7.2 2020-12-30 r5155
       $Id: smartd.conf.5.in 5118 2020-11-23 18:25:16Z chrfranke $



smartmontools-7.2                            2020-12-30                               SMARTD.CONF(5)
SMARTD.CONF(5)
NAME DESCRIPTION DEFAULT SETTINGS CONFIGURATION FILE DIRECTIVES
-d TYPE -n POWERMODE[,N][,q] -T TYPE -o VALUE -S VALUE -H [ATA] Check the health status of the disk with the SMART RETURN STATUS command. If -l TYPE -e NAME[,VALUE] -s REGEXP -m ADD Send a warning email to the email address ADD if the '-H', '-l error', '-l xerror', -M TYPE -f [ATA only] Check for 'failure' of any Usage Attributes. If these Attributes are less -p [ATA only] Report anytime that a Prefail Attribute has changed its value since the -u [ATA only] Report anytime that a Usage Attribute has changed its value since the last -t [ATA only] Equivalent to turning on the two previous flags '-p' and '-u'. Tracks -i ID [ATA only] Ignore device Attribute number ID when checking for failure of Usage At‐ -I ID [ATA only] Ignore device Attribute ID when tracking changes in the Attribute values. -r ID[!] -R ID[!] -C ID[+] -U ID[+] -W DIFF[,INFO[,CRIT]] -F TYPE -v ID,FORMAT[:BYTEORDER][,NAME] -P TYPE -a Equivalent to turning on all of the following Directives: '-H' to check the SMART -H -l selftest -l error -f. EXAMPLES OF SHELL SCRIPTS FOR '-M exec'
FILES
/etc/smartd.conf
SEE ALSO PACKAGE VERSION

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