pvck(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | USAGE | OPTIONS | VARIABLES | ENVIRONMENT VARIABLES | EXAMPLES | SEE ALSO | COLOPHON

PVCK(8)                  System Manager's Manual                 PVCK(8)

NAME         top

       pvck — Check metadata on physical volumes

SYNOPSIS         top

       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         top

       pvck checks and repairs LVM metadata on PVs.

   Dump options
       headers
       Print  LVM on-disk headers and structures: label_header, pv_head‐
       er, 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  de‐
       vice.   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  meta‐
       data 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,  us‐
       ing  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  metada‐
       ta,  use  --settings "metadata_offset=<offset>", where the offset
       is taken from the list of versions found.  Use -v to include  de‐
       scriptions 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 re‐
       pair.  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  dam‐
       aged,  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 la‐
       bel_header.

       --repairtype metadata
       Repairs the mda_header and metadata text.  It requires the  head‐
       ers 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 re‐
       pair 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 in‐
       cludes 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 spec‐
       ified,  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 fol‐
       lows the first metadata area.

USAGE         top

       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         top


       --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
              Devices that the command can use. This option can  be  re‐
              peated  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) de‐
              vices/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  re‐
              pair.   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 informa‐
              tion 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 differ‐
              ent sector near the start of the disk (between 0 and 3 in‐
              clusive - 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.

       --profile String
              An  alias  for  --commandprofile or --metadataprofile, de‐
              pending 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  use‐
              ful 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 descrip‐
              tion.

       --settings String
              Specifies command specific settings in "Key = Value" form.
              Combine multiple settings in quotes, or  repeat  the  set‐
              tings option for each.

       -t|--test
              Run in test mode. Commands will not update metadata.  This
              is  implemented by disabling all metadata writing but nev‐
              ertheless returning success to the calling function.  This
              may  lead  to unusual error messages in multi-stage opera‐
              tions if a tool relies on reading  back  metadata  it  be‐
              lieves 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 au‐
              tomatic no, see -qq.)

VARIABLES         top

       PV     Physical Volume name, a device path under /dev.  For com‐
              mands managing physical extents, a PV positional arg gen‐
              erally 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, regard‐
              less of capitalization, e.g. 'k' and 'K' both refer to
              1024.  The default input unit is specified by letter, fol‐
              lowed 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 con‐
              trol --units, where capital letters mean multiple of
              1000.)

ENVIRONMENT VARIABLES         top

       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         top

       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 pa‐
       rameter with a value of 204800 (100 * 1024 * 1024 / 512 =
       204800).
       pvck --labelsector 204800 /dev/sda

SEE ALSO         top

       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)

COLOPHON         top

       This page is part of the lvm2 (Logical Volume Manager 2) project.
       Information about the project can be found at 
       ⟨http://www.sourceware.org/lvm2/⟩.  If you have a bug report for
       this manual page, see ⟨https://github.com/lvmteam/lvm2/issues⟩.
       This page was obtained from the project's upstream Git repository
       ⟨git://sourceware.org/git/lvm2.git⟩ on 2024-06-14.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2024-06-11.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

Red Hat, Inc.     LVM TOOLS 2.03.25(2)-git (2024-05-16)          PVCK(8)

Pages that refer to this page: lvchange(8)lvconvert(8)lvcreate(8)lvdisplay(8)lvextend(8)lvm(8)lvmconfig(8)lvmdevices(8)lvmdiskscan(8)lvm-fullreport(8)lvm-lvpoll(8)lvreduce(8)lvremove(8)lvrename(8)lvresize(8)lvs(8)lvscan(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)vgconvert(8)vgcreate(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)