Provided by: lvm2_2.03.02-2ubuntu6_amd64 bug

NAME

       lvchange - Change the attributes of logical volume(s)

SYNOPSIS

       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
        -d|--debug
           --deduplication y|n
           --deltag Tag
           --detachprofile
           --discards passdown|nopassdown|ignore
           --driverloaded y|n
           --errorwhenfull y|n
        -f|--force
        -h|--help
        -K|--ignoreactivationskip
           --ignorelockingfailure
           --ignoremonitoring
           --lockopt String
           --longhelp
        -j|--major Number
           --[raid]maxrecoveryrate Size[k|UNIT]
           --metadataprofile String
           --minor Number
           --[raid]minrecoveryrate Size[k|UNIT]
           --monitor y|n
           --nolocking
           --noudevsync
        -P|--partial
        -p|--permission rw|r
        -M|--persistent y|n
           --poll y|n
           --profile String
        -q|--quiet
        -r|--readahead auto|none|Number
           --readonly
           --rebuild PV
           --refresh
           --reportformat basic|json
           --resync
        -S|--select String
        -k|--setactivationskip y|n
           --[raid]syncaction check|repair
           --sysinit
        -t|--test
        -v|--verbose
           --version
           --[raid]writebehind Number
           --[raid]writemostly PV[:t|n|y]
        -y|--yes
        -Z|--zero y|n

DESCRIPTION

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

USAGE

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

       lvchange
           ( -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,
                --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit,
                --compression y|n,
                --deduplication y|n,
                --detachprofile,
                --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.

       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

       -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 tags.

       --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 configured).

       --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.

       --detachprofile
              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.

       -h|--help
              Display help text.

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

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

       --ignoremonitoring
              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.

       --longhelp
              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.

       --nolocking
              Disable locking.

       --noudevsync
              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 creates.

       -P|--partial
              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.

       --readonly
              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.

       --refresh
              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 used.

       --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.

       --resync
              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 bits.

       --[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.

       --sysinit
              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.

       -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.

       --[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.

       -y|--yes
              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

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

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

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

       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: 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.)

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

       Change LV permission to read-only:

       lvchange -pr vg00/lvol1

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)
       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) lvmdbusd(8)

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