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PVCK(8) System Manager's Manual PVCK(8)
NAME
pvck - Check metadata on physical volumes
SYNOPSIS
pvck option_args position_args
[ option_args ]
--commandprofile String
--config String
-d|--debug
--driverloaded y|n
--dump headers|metadata|metadata_all|metadata_search
-f|--file String
-h|--help
--labelsector Number
--lockopt String
--longhelp
--nolocking
--profile String
--[pv]metadatacopies 0|1|2
-q|--quiet
--repair
--repairtype pv_header|metadata|label_header
--settings String
-t|--test
-v|--verbose
--version
-y|--yes
DESCRIPTION
pvck checks and repairs LVM metadata on PVs.
Dump options
headers
Print LVM on-disk headers and structures: label_header, pv_header, mda_header(s), and
metadata text. Warnings are printed if any values are incorrect. The label_header and
pv_header both exist in a 512 byte sector, usually the second sector of the device. An
mda_header exists in a 512 byte sector at offset 4096 bytes. A second mda_header can op-
tionally exist near the end of the device. The metadata text exists in an area (about
1MiB by default) immediately following the mda_header sector. The metadata text is
checked but not printed (see other options).
metadata
Print the current LVM VG metadata text (or save to a file), using headers to locate the
latest copy of metadata. If headers are damaged, metadata may not be found (see meta-
data_search). Use --settings "mda_num=2" to look in mda2 (the second mda at the end of
the device, if used). The metadata text is printed to stdout or saved to a file with
--file.
metadata_all
List all versions of VG metadata found in the metadata area, using headers to locate meta-
data. Full copies of all metadata are saved to a file with the --file option. If headers
are damaged, metadata may not be found (see metadata_search). Use --settings "mda_num=2"
as above. Use -v to include descriptions and dates when listing metadata versions.
metadata_search
List all versions of VG metadata found in the metadata area, searching common locations so
metadata can be found if headers are damaged. Full copies of all metadata are saved to a
file with the --file option. To save one specific version of metadata, use --settings
"metadata_offset=<offset>", where the offset is taken from the list of versions found.
Use -v to include descriptions and dates when listing metadata versions.
metadata_area
Save the entire text metadata area to a file without processing.
Repair options
--repair
Repair headers and metadata on a PV. This uses a metadata input file that was extracted
by --dump, or a backup file (from /etc/lvm/backup). When possible, use metadata saved by
--dump from another PV in the same VG (or from a second metadata area on the PV).
There are cases where the PV UUID needs to be specified for the PV being repaired. It is
specified using --settings "pv_uuid=<UUID>". In particular, if the device name for the PV
being repaired does not match the previous device name of the PV, then LVM may not be able
to determine the correct PV UUID. When headers are damaged on more than one PV in a VG,
it is important for the user to determine the correct PV UUID and specify it in --set-
tings. Otherwise, the wrong PV UUID could be used if device names have been swapped since
the metadata was last written.
If a PV has no metadata areas and the pv_header is damaged, then the repair will not know
to create no metadata areas during repair. It will by default repair metadata in mda1.
To repair with no metadata areas, use --settings "mda_offset=0 mda_size=0".
There are cases where repair should be run on all PVs in the VG (using the same metadata
file): if all PVs in the VG are damaged, if using an old metadata version, or if a backup
file is used instead of raw metadata (taken from pvck dump.)
Using --repair is equivalent to running --repairtype pv_header followed by --repairtype
metadata.
--repairtype pv_header
Repairs the header sector, containing the pv_header and label_header.
--repairtype metadata
Repairs the mda_header and metadata text. It requires the headers to be correct (having
been undamaged or already repaired).
--repairtype label_header
Repairs label_header fields, leaving the pv_header (in the same sector) unchanged. (re-
pairtype pv_header should usually be used instead.)
Settings
The --settings option controls or overrides certain dump or repair behaviors. All offset
and size values in settings are in bytes (units are not recognized.) These settings are
subject to change.
mda_num=1|2
Select which metadata area should be used. By default the first metadata area (1) is
used. mda1 is always located at offset 4096. mda2, at the end of the device, often does
not exist (it's not created by default.) If mda1 is erased, mda2, if it exists, will often
still have metadata.
metadata_offset=bytes
Select metadata text at this offset. Use with metadata_search to print/save one instance
of metadata text.
mda_offset=bytes mda_size=bytes
Refers to a metadata area (mda) location and size. An mda includes an mda_header and cir-
cular metadata text buffer. Setting this forces metadata_search look for metadata in the
given area instead of the standard locations. When set to zero with repair, it indicates
no metadata areas should exist.
mda2_offset=bytes mda2_size=bytes
When repairing a pv_header, this forces a specific offset and size for mda2 that should be
recorded in the pv_header.
pv_uuid=uuid
Specify the PV UUID of the device being repaired. When not specified, repair will attempt
to determine the correct PV UUID by matching a device name in the metadata.
device_size=bytes
data_offset=bytes
When repairing a pv_header, the device_size, data_offset, and pvid can all be specified
directly, in which case these values are not taken from a metadata file (where they usu-
ally come from), and the metadata file can be omitted. data_offset is the starting loca-
tion of the first physical extent (data), which follows the first metadata area.
USAGE
Check for metadata on a device
pvck PV ...
[ COMMON_OPTIONS ]
-
Check and print LVM headers and metadata on a device
pvck --dump headers|metadata|metadata_all|metadata_search PV
[ -f|--file String ]
[ --settings String ]
[ --[pv]metadatacopies 0|1|2 ]
[ COMMON_OPTIONS ]
-
Repair LVM headers or metadata on a device
pvck --repairtype pv_header|metadata|label_header PV
[ -f|--file String ]
[ --settings String ]
[ COMMON_OPTIONS ]
-
Repair LVM headers and metadata on a device
pvck --repair -f|--file String PV
[ --settings String ]
[ COMMON_OPTIONS ]
-
Common options for command:
[ --labelsector Number ]
Common options for lvm:
[ -d|--debug ]
[ -h|--help ]
[ -q|--quiet ]
[ -t|--test ]
[ -v|--verbose ]
[ -y|--yes ]
[ --commandprofile String ]
[ --config String ]
[ --driverloaded y|n ]
[ --lockopt String ]
[ --longhelp ]
[ --nolocking ]
[ --profile String ]
[ --version ]
OPTIONS
--commandprofile String
The command profile to use for command configuration. See lvm.conf(5) for more in-
formation about profiles.
--config String
Config settings for the command. These override lvm.conf settings. The String arg
uses the same format as lvm.conf, or may use section/field syntax. See lvm.conf(5)
for more information about config.
-d|--debug ...
Set debug level. Repeat from 1 to 6 times to increase the detail of messages sent
to the log file and/or syslog (if configured).
--driverloaded y|n
If set to no, the command will not attempt to use device-mapper. For testing and
debugging.
--dump headers|metadata|metadata_all|metadata_search
Dump headers and metadata from a PV for debugging and repair. Option values in-
clude: headers to print and check LVM headers, metadata to print or save the cur-
rent text metadata, metadata_all to list or save all versions of metadata, meta-
data_search to list or save all versions of metadata, searching standard locations
in case of damaged headers, metadata_area to save an entire text metadata area to a
file.
-f|--file String
Metadata file to read or write.
-h|--help
Display help text.
--labelsector Number
By default the PV is labelled with an LVM2 identifier in its second sector (sector
1). This lets you use a different sector near the start of the disk (between 0 and
3 inclusive - see LABEL_SCAN_SECTORS in the source). Use with care.
--lockopt String
Used to pass options for special cases to lvmlockd. See lvmlockd(8) for more in-
formation.
--longhelp
Display long help text.
--nolocking
Disable locking.
--profile String
An alias for --commandprofile or --metadataprofile, depending on the command.
--[pv]metadatacopies 0|1|2
The number of metadata areas to set aside on a PV for storing VG metadata. When 2,
one copy of the VG metadata is stored at the front of the PV and a second copy is
stored at the end. When 1, one copy of the VG metadata is stored at the front of
the PV. When 0, no copies of the VG metadata are stored on the given PV. This may
be useful in VGs containing many PVs (this places limitations on the ability to use
vgsplit later.)
-q|--quiet ...
Suppress output and log messages. Overrides --debug and --verbose. Repeat once to
also suppress any prompts with answer 'no'.
--repair
Repair headers and metadata on a PV.
--repairtype pv_header|metadata|label_header
Repair headers and metadata on a PV. See command description.
--settings String
Specifies command specific settings in "Key = Value" form. Combine multiple set-
tings in quotes, or repeat the settings option for each.
-t|--test
Run in test mode. Commands will not update metadata. This is implemented by dis-
abling all metadata writing but nevertheless returning success to the calling func-
tion. This may lead to unusual error messages in multi-stage operations if a tool
relies on reading back metadata it believes has changed but hasn't.
-v|--verbose ...
Set verbose level. Repeat from 1 to 4 times to increase the detail of messages sent
to stdout and stderr.
--version
Display version information.
-y|--yes
Do not prompt for confirmation interactively but always assume the answer yes. Use
with extreme caution. (For automatic no, see -qq.)
VARIABLES
PV
Physical Volume name, a device path under /dev. For commands managing physical ex-
tents, a PV positional arg generally accepts a suffix indicating a range (or multi-
ple ranges) of physical extents (PEs). When the first PE is omitted, it defaults to
the start of the device, and when the last PE is omitted it defaults to end. Start
and end range (inclusive): PV[:PE-PE]... Start and length range (counting from 0):
PV[:PE+PE]...
String
See the option description for information about the string content.
Size[UNIT]
Size is an input number that accepts an optional unit. Input units are always
treated as base two values, regardless of capitalization, e.g. 'k' and 'K' both re-
fer to 1024. The default input unit is specified by letter, followed by |UNIT.
UNIT represents other possible input units: bBsSkKmMgGtTpPeE. b|B is bytes, s|S is
sectors of 512 bytes, k|K is KiB, m|M is MiB, g|G is GiB, t|T is TiB, p|P is PiB,
e|E is EiB. (This should not be confused with the output control --units, where
capital letters mean multiple of 1000.)
ENVIRONMENT VARIABLES
See lvm(8) for information about environment variables used by lvm. For example,
LVM_VG_NAME can generally be substituted for a required VG parameter.
EXAMPLES
If the partition table is corrupted or lost on /dev/sda, and you suspect there was an LVM
partition at approximately 100 MiB, then this area of the disk can be scanned using the
--labelsector parameter with a value of 204800 (100 * 1024 * 1024 / 512 = 204800).
pvck --labelsector 204800 /dev/sda
SEE ALSO
lvm(8) lvm.conf(5) lvmconfig(8)
pvchange(8) pvck(8) pvcreate(8) pvdisplay(8) pvmove(8) pvremove(8) pvresize(8) pvs(8) pvs-
can(8)
vgcfgbackup(8) vgcfgrestore(8) vgchange(8) vgck(8) vgcreate(8) vgconvert(8) vgdisplay(8)
vgexport(8) vgextend(8) vgimport(8) vgimportclone(8) vgmerge(8) vgmknodes(8) vgreduce(8)
vgremove(8) vgrename(8) vgs(8) vgscan(8) vgsplit(8)
lvcreate(8) lvchange(8) lvconvert(8) lvdisplay(8) lvextend(8) lvreduce(8) lvremove(8)
lvrename(8) lvresize(8) lvs(8) lvscan(8)
lvm-fullreport(8) lvm-lvpoll(8) lvm2-activation-generator(8) blkdeactivate(8) lvmdump(8)
dmeventd(8) lvmpolld(8) lvmlockd(8) lvmlockctl(8) cmirrord(8) lvmdbusd(8)
lvmsystemid(7) lvmreport(7) lvmraid(7) lvmthin(7) lvmcache(7)
Red Hat, Inc. LVM TOOLS 2.03.11(2) (2021-01-08) PVCK(8)
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Under GNU General Public License
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