lvchange(8) — Linux manual page


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

NAME         top

       lvchange - Change the attributes of logical volume(s)

SYNOPSIS         top

       lvchange option_args position_args
           [ option_args ]

        -a|--activate y|n|ay
           --activationmode partial|degraded|complete
           --addtag Tag
           --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit
        -A|--autobackup y|n
           --cachemode writethrough|writeback|passthrough
           --cachepolicy String
           --cachesettings String
           --commandprofile String
           --compression y|n
           --config String
        -C|--contiguous y|n
           --deduplication y|n
           --deltag Tag
           --discards passdown|nopassdown|ignore
           --driverloaded y|n
           --errorwhenfull y|n
           --lockopt String
        -j|--major Number
           --[raid]maxrecoveryrate Size[k|UNIT]
           --metadataprofile String
           --minor Number
           --[raid]minrecoveryrate Size[k|UNIT]
           --monitor y|n
        -p|--permission rw|r
        -M|--persistent y|n
           --poll y|n
           --profile String
        -r|--readahead auto|none|Number
           --rebuild PV
           --reportformat basic|json
        -S|--select String
        -k|--setactivationskip y|n
           --[raid]syncaction check|repair
           --[raid]writebehind Number
           --[raid]writemostly PV[:t|n|y]
        -Z|--zero y|n

DESCRIPTION         top

       lvchange changes LV attributes in the VG, changes LV activation in
       the kernel, and includes other utilities for LV maintenance.

USAGE         top

       Change a general LV attribute.
       For options listed in parentheses, any one is
       required, after which the others are optional.

           ( -C|--contiguous y|n,
             -p|--permission rw|r,
             -r|--readahead auto|none|Number,
             -k|--setactivationskip y|n,
             -Z|--zero y|n,
             -M|--persistent n,
                --addtag Tag,
                --deltag Tag,
                --compression y|n,
                --deduplication y|n,
                --metadataprofile String,
                --profile String,
                --errorwhenfull y|n,
                --discards passdown|nopassdown|ignore,
                --cachemode writethrough|writeback|passthrough,
                --cachepolicy String,
                --cachesettings String,
                --[raid]minrecoveryrate Size[k|UNIT],
                --[raid]maxrecoveryrate Size[k|UNIT],
                --[raid]writebehind Number,
                --[raid]writemostly PV[:t|n|y] )
            VG|LV|Tag|Select ...
           [ -a|--activate y|n|ay ]
           [    --poll y|n ]
           [    --monitor y|n ]
           [ COMMON_OPTIONS ]

       Resyncronize a mirror or raid LV.
       Use to reset 'R' attribute on a not initially synchronized LV.

       lvchange --resync VG|LV_mirror_raid|Tag|Select ...
           [ -a|--activate y|n|ay ]
           [ COMMON_OPTIONS ]

       Resynchronize or check a raid LV.

       lvchange --syncaction check|repair VG|LV_raid|Tag|Select ...
           [ COMMON_OPTIONS ]

       Reconstruct data on specific PVs of a raid LV.

       lvchange --rebuild PV VG|LV_raid|Tag|Select ...
           [ COMMON_OPTIONS ]

       Activate or deactivate an LV.

       lvchange -a|--activate y|n|ay VG|LV|Tag|Select ...
           [ -P|--partial ]
           [ -K|--ignoreactivationskip ]
           [    --activationmode partial|degraded|complete ]
           [    --poll y|n ]
           [    --monitor y|n ]
           [    --ignorelockingfailure ]
           [    --sysinit ]
           [    --readonly ]
           [ COMMON_OPTIONS ]

       Reactivate an LV using the latest metadata.

       lvchange --refresh VG|LV|Tag|Select ...
           [ -P|--partial ]
           [    --activationmode partial|degraded|complete ]
           [    --poll y|n ]
           [    --monitor y|n ]
           [ COMMON_OPTIONS ]

       Start or stop monitoring an LV from dmeventd.

       lvchange --monitor y|n VG|LV|Tag|Select ...
           [ COMMON_OPTIONS ]

       Start or stop processing an LV conversion.

       lvchange --poll y|n VG|LV|Tag|Select ...
           [    --monitor y|n ]
           [ COMMON_OPTIONS ]

       Make the minor device number persistent for an LV.

       lvchange -M|--persistent y --minor Number LV
           [ -j|--major Number ]
           [ -a|--activate y|n|ay ]
           [    --poll y|n ]
           [    --monitor y|n ]
           [ COMMON_OPTIONS ]

       Common options for command:
           [ -A|--autobackup y|n ]
           [ -f|--force ]
           [ -S|--select String ]
           [    --ignoremonitoring ]
           [    --noudevsync ]
           [    --reportformat basic|json ]

       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         top

       -a|--activate y|n|ay
              Change the active state of LVs.  An active LV can be used
              through a block device, allowing data on the LV to be
              accessed.  y makes LVs active, or available.  n makes LVs
              inactive, or unavailable.  The block device for the LV is
              added or removed from the system using device-mapper in the
              kernel.  A symbolic link /dev/VGName/LVName pointing to the
              device node is also added/removed.  All software and scripts
              should access the device through the symbolic link and present
              this as the name of the device.  The location and name of the
              underlying device node may depend on the distribution,
              configuration (e.g. udev), or release version.  ay specifies
              autoactivation, in which case an LV is activated only if it
              matches an item in lvm.conf
              activation/auto_activation_volume_list.  If the list is not
              set, all LVs are considered to match, and if if the list is
              set but empty, no LVs match.  Autoactivation should be used
              during system boot to make it possible to select which LVs
              should be automatically activated by the system.  See
              lvmlockd(8) for more information about activation options ey
              and sy for shared VGs.

       --activationmode partial|degraded|complete
              Determines if LV activation is allowed when PVs are missing,
              e.g. because of a device failure.  complete only allows LVs
              with no missing PVs to be activated, and is the most
              restrictive mode.  degraded allows RAID LVs with missing PVs
              to be activated.  (This does not include the "mirror" type,
              see "raid1" instead.)  partial allows any LV with missing PVs
              to be activated, and should only be used for recovery or
              repair.  For default, see lvm.conf/activation_mode.  See
              lvmraid(7) for more information.

       --addtag Tag
              Adds a tag to a PV, VG or LV. This option can be repeated to
              add multiple tags at once. See lvm(8) for information about

       --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit
              Determines the allocation policy when a command needs to
              allocate Physical Extents (PEs) from the VG. Each VG and LV
              has an allocation policy which can be changed with
              vgchange/lvchange, or overriden on the command line.  normal
              applies common sense rules such as not placing parallel
              stripes on the same PV.  inherit applies the VG policy to an
              LV.  contiguous requires new PEs be placed adjacent to
              existing PEs.  cling places new PEs on the same PV as existing
              PEs in the same stripe of the LV.  If there are sufficient PEs
              for an allocation, but normal does not use them, anywhere will
              use them even if it reduces performance, e.g. by placing two
              stripes on the same PV.  Optional positional PV args on the
              command line can also be used to limit which PVs the command
              will use for allocation.  See lvm(8) for more information
              about allocation.

       -A|--autobackup y|n
              Specifies if metadata should be backed up automatically after
              a change.  Enabling this is strongly advised! See
              vgcfgbackup(8) for more information.

       --cachemode writethrough|writeback|passthrough
              Specifies when writes to a cache LV should be considered
              complete.  writeback considers a write complete as soon as it
              is stored in the cache pool.  writethough considers a write
              complete only when it has been stored in both the cache pool
              and on the origin LV.  While writethrough may be slower for
              writes, it is more resilient if something should happen to a
              device associated with the cache pool LV. With passthrough,
              all reads are served from the origin LV (all reads miss the
              cache) and all writes are forwarded to the origin LV;
              additionally, write hits cause cache block invalidates. See
              lvmcache(7) for more information.

       --cachepolicy String
              Specifies the cache policy for a cache LV.  See lvmcache(7)
              for more information.

       --cachesettings String
              Specifies tunable values for a cache LV in "Key = Value" form.
              Repeat this option to specify multiple values.  (The default
              values should usually be adequate.)  The special string value
              default switches settings back to their default kernel values
              and removes them from the list of settings stored in LVM
              metadata.  See lvmcache(7) for more information.

       --commandprofile String
              The command profile to use for command configuration.  See
              lvm.conf(5) for more information about profiles.

       --compression y|n
              Controls whether compression is enabled or disable for VDO
              volume.  See lvmvdo(7) for more information about VDO usage.

       --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.

       -C|--contiguous y|n
              Sets or resets the contiguous allocation policy for LVs.
              Default is no contiguous allocation based on a next free
              principle.  It is only possible to change a non-contiguous
              allocation policy to contiguous if all of the allocated
              physical extents in the LV are already contiguous.

       -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

       --deduplication y|n
              Controls whether deduplication is enabled or disable for VDO
              volume.  See lvmvdo(7) for more information about VDO usage.

       --deltag Tag
              Deletes a tag from a PV, VG or LV. This option can be repeated
              to delete multiple tags at once. See lvm(8) for information
              about tags.

              Detaches a metadata profile from a VG or LV.  See lvm.conf(5)
              for more information about profiles.

       --discards passdown|nopassdown|ignore
              Specifies how the device-mapper thin pool layer in the kernel
              should handle discards.  ignore causes the thin pool to ignore
              discards.  nopassdown causes the thin pool to process discards
              itself to allow reuse of unneeded extents in the thin pool.
              passdown causes the thin pool to process discards itself (like
              nopassdown) and pass the discards to the underlying device.
              See lvmthin(7) for more information.

       --driverloaded y|n
              If set to no, the command will not attempt to use device-
              mapper.  For testing and debugging.

       --errorwhenfull y|n
              Specifies thin pool behavior when data space is exhausted.
              When yes, device-mapper will immediately return an error when
              a thin pool is full and an I/O request requires space.  When
              no, device-mapper will queue these I/O requests for a period
              of time to allow the thin pool to be extended.  Errors are
              returned if no space is available after the timeout.  (Also
              see dm-thin-pool kernel module option no_space_timeout.)  See
              lvmthin(7) for more information.

       -f|--force ...
              Override various checks, confirmations and protections.  Use
              with extreme caution.

              Display help text.

              Ignore the "activation skip" LV flag during activation to
              allow LVs with the flag set to be activated.

              Allows a command to continue with read-only metadata
              operations after locking failures.

              Do not interact with dmeventd unless --monitor is specified.
              Do not use this if dmeventd is already monitoring a device.

       --lockopt String
              Used to pass options for special cases to lvmlockd.  See
              lvmlockd(8) for more information.

              Display long help text.

       -j|--major Number
              Sets the major number of an LV block device.

       --[raid]maxrecoveryrate Size[k|UNIT]
              Sets the maximum recovery rate for a RAID LV.  The rate value
              is an amount of data per second for each device in the array.
              Setting the rate to 0 means it will be unbounded.  See
              lvmraid(7) for more information.

       --metadataprofile String
              The metadata profile to use for command configuration.  See
              lvm.conf(5) for more information about profiles.

       --minor Number
              Sets the minor number of an LV block device.

       --[raid]minrecoveryrate Size[k|UNIT]
              Sets the minimum recovery rate for a RAID LV.  The rate value
              is an amount of data per second for each device in the array.
              Setting the rate to 0 means it will be unbounded.  See
              lvmraid(7) for more information.

       --monitor y|n
              Start (yes) or stop (no) monitoring an LV with dmeventd.
              dmeventd monitors kernel events for an LV, and performs
              automated maintenance for the LV in reponse to specific
              events.  See dmeventd(8) for more information.

              Disable locking.

              Disables udev synchronisation. The process will not wait for
              notification from udev. It will continue irrespective of any
              possible udev processing in the background. Only use this if
              udev is not running or has rules that ignore the devices LVM

              Commands will do their best to activate LVs with missing PV
              extents.  Missing extents may be replaced with error or zero
              segments according to the lvm.conf missing_stripe_filler
              setting.  Metadata may not be changed with this option.

       -p|--permission rw|r
              Set access permission to read only r or read and write rw.

       -M|--persistent y|n
              When yes, makes the specified minor number persistent.

       --poll y|n
              When yes, start the background transformation of an LV.  An
              incomplete transformation, e.g. pvmove or lvconvert
              interrupted by reboot or crash, can be restarted from the last
              checkpoint with --poll y.  When no, background transformation
              of an LV will not occur, and the transformation will not
              complete. It may not be appropriate to immediately poll an LV
              after activation, in which case --poll n can be used to defer
              polling until a later --poll y command.

       --profile String
              An alias for --commandprofile or --metadataprofile, depending
              on the command.

       -q|--quiet ...
              Suppress output and log messages. Overrides --debug and
              --verbose.  Repeat once to also suppress any prompts with
              answer 'no'.

       -r|--readahead auto|none|Number
              Sets read ahead sector count of an LV.  auto is the default
              which allows the kernel to choose a suitable value
              automatically.  none is equivalent to zero.

              Run the command in a special read-only mode which will read
              on-disk metadata without needing to take any locks. This can
              be used to peek inside metadata used by a virtual machine
              image while the virtual machine is running. No attempt will be
              made to communicate with the device-mapper kernel driver, so
              this option is unable to report whether or not LVs are
              actually in use.

       --rebuild PV
              Selects a PV to rebuild in a raid LV. Multiple PVs can be
              rebuilt by repeating this option.  Use this option in place of
              --resync or --syncaction repair when the PVs with corrupted
              data are known, and their data should be reconstructed rather
              than reconstructing default (rotating) data.  See lvmraid(7)
              for more information.

              If the LV is active, reload its metadata.  This is not
              necessary in normal operation, but may be useful if something
              has gone wrong, or if some form of manual LV sharing is being

       --reportformat basic|json
              Overrides current output format for reports which is defined
              globally by the report/output_format setting in lvm.conf.
              basic is the original format with columns and rows.  If there
              is more than one report per command, each report is prefixed
              with the report name for identification. json produces report
              output in JSON format. See lvmreport(7) for more information.

              Initiates mirror synchronization. Synchronization generally
              happens automatically, but this option forces it to run.  Also
              see --rebuild to synchronize a specific PV.  During
              synchronization, data is read from the primary mirror device
              and copied to the others. This can take considerable time,
              during which the LV is without a complete redundant copy of
              the data.  See lvmraid(7) for more information.

       -S|--select String
              Select objects for processing and reporting based on specified
              criteria.  The criteria syntax is described by --select help
              and lvmreport(7).  For reporting commands, one row is
              displayed for each object matching the criteria.  See
              --options help for selectable object fields.  Rows can be
              displayed with an additional "selected" field (-o selected)
              showing 1 if the row matches the selection and 0 otherwise.
              For non-reporting commands which process LVM entities, the
              selection is used to choose items to process.

       -k|--setactivationskip y|n
              Persistently sets (yes) or clears (no) the "activation skip"
              flag on an LV.  An LV with this flag set is not activated
              unless the --ignoreactivationskip option is used by the
              activation command.  This flag is set by default on new thin
              snapshot LVs.  The flag is not applied to deactivation.  The
              current value of the flag is indicated in the lvs lv_attr

       --[raid]syncaction check|repair
              Initiate different types of RAID synchronization.  This causes
              the RAID LV to read all data and parity blocks in the array
              and check for discrepancies (mismatches between mirrors or
              incorrect parity values).  check will count but not correct
              discrepancies.  repair will correct discrepancies.  See lvs
              for reporting discrepancies found or repaired.

              Indicates that vgchange/lvchange is being invoked from early
              system initialisation scripts (e.g. rc.sysinit or an initrd),
              before writable filesystems are available. As such, some
              functionality needs to be disabled and this option acts as a
              shortcut which selects an appropriate set of options.
              Currently, this is equivalent to using --ignorelockingfailure,
              --ignoremonitoring, --poll n, and setting env var
              LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES.  vgchange/lvchange skip
              autoactivation, and defer to pvscan autoactivation.

              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

       -v|--verbose ...
              Set verbose level. Repeat from 1 to 4 times to increase the
              detail of messages sent to stdout and stderr.

              Display version information.

       --[raid]writebehind Number
              The maximum number of outstanding writes that are allowed to
              devices in a RAID1 LV that is marked write-mostly.  Once this
              value is exceeded, writes become synchronous (i.e. all writes
              to the constituent devices must complete before the array
              signals the write has completed). Setting the value to zero
              clears the preference and allows the system to choose the
              value arbitrarily.

       --[raid]writemostly PV[:t|n|y]
              Mark a device in a RAID1 LV as write-mostly.  All reads to
              these drives will be avoided unless absolutely necessary. This
              keeps the number of I/Os to the drive to a minimum. The
              default behavior is to set the write-mostly attribute for the
              specified PV.  It is also possible to remove the write-mostly
              flag by adding the suffix :n at the end of the PV name, or to
              toggle the value with the suffix :t. Repeat this option to
              change the attribute on multiple PVs.

              Do not prompt for confirmation interactively but always assume
              the answer yes. Use with extreme caution.  (For automatic no,
              see -qq.)

       -Z|--zero y|n
              Set zeroing mode for thin pool. Note: already provisioned
              blocks from pool in non-zero mode are not cleared in unwritten
              parts when setting --zero y.

VARIABLES         top

              Volume Group name.  See lvm(8) for valid names.

              Logical Volume name.  See lvm(8) for valid names.  An LV
              positional arg generally includes the VG name and LV name,
              e.g. VG/LV.  LV followed by _<type> indicates that an LV of
              the given type is required. (raid represents raid<N> type)

              Tag name.  See lvm(8) for information about tag names and
              using tags in place of a VG, LV or PV.

              Select indicates that a required positional parameter can be
              omitted if the --select option is used.  No arg appears in
              this position.

              See the option description for information about the string

              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: bBsSkKmMgGtTpPeE.
              b|B is bytes, s|S is sectors of 512 bytes, k|K is kilobytes,
              m|M is megabytes, g|G is gigabytes, t|T is terabytes, p|P is
              petabytes, e|E is exabytes.  (This should not be confused with
              the output control --units, where capital letters mean
              multiple of 1000.)


       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

       Change LV permission to read-only:

       lvchange -pr vg00/lvol1

SEE ALSO         top

       lvm(8) lvm.conf(5) lvmconfig(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) 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)

       lvmsystemid(7) lvmreport(7) lvmraid(7) lvmthin(7) lvmcache(7)

COLOPHON         top

       This page is part of the lvm2 (Logical Volume Manager 2) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this
       manual page, see ⟨⟩.  This page
       was obtained from the tarball fetched from
       ⟨⟩ on 2020-08-13.  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

Red Hat, Inc.         LVM TOOLS 2.03.10(2) (2020-08-09)          LVCHANGE(8)

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