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SG_SYNC(8)                                    SG3_UTILS                                   SG_SYNC(8)



NAME
       sg_sync - send SCSI SYNCHRONIZE CACHE command

SYNOPSIS
       sg_sync  [--16]  [--count=COUNT]  [--group=GN]  [--help]  [--immed]  [--lba=LBA]  [--sync-nv]
       [--timeout=SECS] [--verbose] [--version] DEVICE

DESCRIPTION
       Send SYNCHRONIZE CACHE(10) or SYNCHRONIZE CACHE(16) command to DEVICE.   These  commands  are
       defined  for  SCSI block devices (see SBC-3). If successful these commands make sure that any
       blocks whose latest versions are held in cache are written to (also termed  as  "synchronized
       with") the medium.

       If  the  LBA  and COUNT arguments are both zero (their defaults) then all blocks in the cache
       are synchronized. If LBA is greater than zero while COUNT is zero then blocks  in  the  cache
       whose addresses are from and including LBA to the highest lba on the device are synchronized.
       If both LBA and COUNT are non zero then blocks in the cache whose addresses lie in the  range
       LBA to LBA+COUNT-1 inclusive are synchronized with the medium.

OPTIONS
       Arguments to long options are mandatory for short options as well.

       -S, --16
              performs  a  SYNCHRONIZE  CACHE(16)  command.  Default  is  to  perform  a SYNCHRONIZE
              CACHE(10) command.

       -c, --count=COUNT
              where COUNT is the number of blocks to synchronize from  and  including  LBA.  Default
              value is 0. When 0 then all blocks in the cache from and including LBA argument to the
              highest block address are synchronized.

       -g, --group=GN
              where GN is the group number which can be between 0 and  63  inclusive.   The  default
              value  is  0  .  Group numbers are used to segregate data collected within the device.
              This is a new feature in SBC-2 and can probably be ignored for the time being.

       -h, --help
              output the usage message then exit.

       -i, --immed
              sets the IMMED bit in the SYNCHRONIZE CACHE command. This instructs the device, if the
              format  of  the command is acceptable, to return a GOOD status immediately rather than
              wait for the blocks in the cache to be synchronized with (i.e. written to) the medium.

       -l, --lba=LBA
              where LBA is the lowest logical block address in  the  cache  to  synchronize  to  the
              medium. Default value is 0 .

       -s, --sync-nv
              synchronize  the (volatile) cache with the non-volatile cache. Without this option (or
              if there is no non-volatile cache in the  device)  the  synchronization  is  with  the
              medium. The SYNC_NV bit was made obsolete in SBC-3 revision 35d.

       -t, --timeout=SECS
              where  SECS  is  the number of seconds the OS allows the SYNCHRONIZE CACHE(16) to com‐
              plete before it tries to cancel the command. Cancelling commands (typically  with  the
              task  management  function "abort task") is best avoided. Note this option is only ac‐
              tive together with the --16 option. The default timeout is 60 seconds  for  both  SYN‐
              CHRONIZE  CACHE(10) and SYNCHRONIZE CACHE(16). Note that timeout issues can be avoided
              with the --immed option.

       -v, --verbose
              increase the level of verbosity, (i.e. debug output).

       -V, --version
              print the version string and then exit.

NOTES
       With the SYNCHRONIZE CACHE(16) command LBA can be up to 64 bits in size and COUNT  up  to  32
       bits  in  size.  With  the  SYNCHRONIZ CACHE(10) command LBA can be up to 32 bits in size and
       COUNT up to 16 bits in size.

       Various numeric arguments (e.g. LBA) may include multiplicative suffixes or be given in hexa‐
       decimal. See the "NUMERIC ARGUMENTS" section in the sg3_utils(8) man page.

EXIT STATUS
       The  exit  status  of  sg_sync is 0 when it is successful. Otherwise see the sg3_utils(8) man
       page.

AUTHORS
       Written by Douglas Gilbert.

REPORTING BUGS
       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT
       Copyright © 2004-2018 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO warranty; not even for MER‐
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SEE ALSO
       sg_start(sg3_utils)



sg3_utils-1.43                                May 2018                                    SG_SYNC(8)