pvck
Check the consistency of physical volume(s)
SYNOPSIS
pvck option_args
position_args
[ option_args ]
--commandprofile String
--config String
-d|--debug
--devices PV
--devicesfile String
--driverloaded
y|n
--dump
headers|metadata|metadata_all|metadata_search
-f|--file String
-h|--help
--journal String
--labelsector Number
--lockopt String
--longhelp
--nohints
--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
optionally 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 metadata_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 metadata. 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 --settings. 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. (repairtype 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 circular 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 usually come from), and the metadata file
can be omitted. data_offset is the starting location 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 ]
[ --devices PV ]
[ --devicesfile String ]
[ --driverloaded y|n ]
[ --journal String ]
[ --lockopt String ]
[ --longhelp ]
[ --nohints ]
[ --nolocking ]
[ --profile String ]
[ --version ]
OPTIONS
--commandprofile String
The command profile to use for command configuration. See
lvm.conf(5) for more information about profiles.
--config String
Config settings for the command. These override
lvm.conf(5) settings. The String arg uses the same
format as lvm.conf(5), 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).
--devices PV
Restricts the devices that are visible and accessible to the command.
Devices not listed will appear to be missing. This option can be
repeated, or accepts a comma separated list of devices. This overrides
the devices file.
--devicesfile String
A file listing devices that LVM should use. The file must exist in
/etc/lvm/devices/ and is managed with the
lvmdevices(8) command. This overrides the
lvm.conf(5) devices/devicesfile and
devices/use_devicesfile settings.
--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 include: headers to print and check LVM headers,
metadata to print or save the current text metadata,
metadata_all to list or save all versions of metadata,
metadata_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.
--journal String
Record information in the systemd journal. This information is in
addition to information enabled by the lvm.conf log/journal setting.
command: record information about the command. output: record the
default command output. debug: record full command debugging.
--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 information.
--longhelp
Display long help text.
--nohints
Do not use the hints file to locate devices for PVs. A command may read
more devices to find PVs when hints are not used. The command will still
perform standard hint file invalidation where appropriate.
--nolocking
Disable locking. Use with caution, concurrent commands may produce
incorrect results.
--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 settings in quotes, or repeat the settings option for each.
-t|--test
Run in test mode. Commands will not update metadata. This is implemented
by disabling all metadata writing but nevertheless returning success to
the calling function. 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 extents, a PV positional arg generally accepts a suffix indicating a range (or multiple 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 refer to 1024. The default input unit is specified by letter, followed by |UNIT. UNIT represents other possible input units: 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), lvmdevices(8), pvchange(8), pvck(8), pvcreate(8), pvdisplay(8), pvmove(8), pvremove(8), pvresize(8), pvs(8), pvscan(8), vgcfgbackup(8), vgcfgrestore(8), vgchange(8), vgck(8), vgcreate(8), vgconvert(8), vgdisplay(8), vgexport(8), vgextend(8), vgimport(8), vgimportclone(8), vgimportdevices(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), blkdeactivate(8), lvmdump(8), dmeventd(8), lvmpolld(8), lvmlockd(8), lvmlockctl(8), cmirrord(8), lvmdbusd(8), fsadm(8), lvmsystemid(7), lvmreport(7), lvmcache(7), lvmraid(7), lvmthin(7), lvmvdo(7), lvmautoactivation(7)