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

NAME         top

       vgchange — change attributes of a volume group

SYNOPSIS         top

       vgchange [--addtag Tag] [--alloc AllocationPolicy] [-A|--autobackup
       {y|n}] [-a|--activate [a|e|s|l] {y|n}] [--activationmode
       {complete|degraded|partial}] [-K|--ignoreactivationskip] [--monitor
       {y|n}] [--poll {y|n}] [-c|--clustered {y|n}] [-u|--uuid]
       [--commandprofile ProfileName] [-d|--debug] [--deltag Tag]
       [--detachprofile] [-h|--help] [--ignorelockingfailure]
       [--ignoremonitoring] [--ignoreskippedcluster] [--sysinit]
       [--noudevsync] [--lock-start] [--lock-stop] [--lock-type LockType]
       [-l|--logicalvolume MaxLogicalVolumes] [-p|--maxphysicalvolumes
       MaxPhysicalVolumes] [--metadataprofile ProfileName]
       [--[vg]metadatacopies NumberOfCopies|unmanaged|all] [-P|--partial]
       [-s|--physicalextentsize PhysicalExtentSize[bBsSkKmMgGtTpPeE]]
       [--reportformat {basic|json}] [-S|--select Selection] [--systemid
       SystemID] [--refresh] [-t|--test] [-v|--verbose] [--version]
       [-x|--resizeable {y|n}] [VolumeGroupName...]

DESCRIPTION         top

       vgchange allows you to change the attributes of one or more volume
       groups. Its main purpose is to activate and deactivate
       VolumeGroupName, or all volume groups if none is specified.  Only
       active volume groups are subject to changes and allow access to their
       logical volumes.  [Not yet implemented: During volume group
       activation, if vgchange recognizes snapshot logical volumes which
       were dropped because they ran out of space, it displays a message
       informing the administrator that such snapshots should be removed
       (see lvremove(8)).  ]

OPTIONS         top

       See lvm(8) for common options.

       -A, --autobackup {y|n}
              Controls automatic backup of metadata after the change.  See
              vgcfgbackup(8).  Default is yes.

       -a, --activate [a|e|s|l]{y|n}
              Controls the availability of the logical volumes in the volume
              group for input/output.  In other words, makes the logical
              volumes known/unknown to the kernel.  If autoactivation option
              is used (-aay), each logical volume in the volume group is
              activated only if it matches an item in the
              activation/auto_activation_volume_list set in lvm.conf. If
              this list is not set, then all volumes are considered for
              activation.  The -aay option should be also used during system
              boot so it's possible to select which volumes to activate
              using the activation/auto_activation_volume_list settting.

              Activation of a logical volume creates a symbolic link
              /dev/VolumeGroupName/LogicalVolumeName pointing to the device
              node.  This link is removed on deactivation.  All software and
              scripts should access the device through this 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 and configuration (e.g. udev) and might change
              from release to release.

              In a clustered VG, clvmd is used for activation, and the
              following options are possible:

              With -aey, clvmd activates the LV in exclusive mode (with an
              exclusive lock), allowing a single node to activate the LV.

              With -asy, clvmd activates the LV in shared mode (with a
              shared lock), allowing multiple nodes to activate the LV
              concurrently.  If the LV type prohibits shared access, such as
              an LV with a snapshot, the 's' option is ignored and an
              exclusive lock is used.

              With -ay (no mode specified), clvmd activates the LV in shared
              mode if the LV type allows concurrent access, such as a linear
              LV.  Otherwise, clvmd activates the LV in exclusive mode.

              With -aey, -asy, and -ay, clvmd attempts to activate the LV on
              all nodes.  If exclusive mode is used, then only one of the
              nodes will be successful.

              With -an, clvmd attempts to deactivate the LV on all nodes.

              With -aly, clvmd activates the LV only on the local node, and
              -aln deactivates only on the local node.  If the LV type
              allows concurrent access, then shared mode is used, otherwise

              LVs with snapshots are always activated exclusively because
              they can only be used on one node at once.

              For local VGs, -ay, -aey, and -asy are all equivalent.

              In a shared VG, lvmlockd is used for locking if LVM is
              compiled with lockd support, and the following options are

              With -aey, the command activates the LV in exclusive mode,
              allowing a single host to activate the LV (the host running
              the command).  Before activating the LV, the command uses
              lvmlockd to acquire an exclusive lock on the LV.  If the lock
              cannot be acquired, the LV is not activated and an error is
              reported.  This would happen if the LV is active on another

              With -asy, the command activates the LV in shared mode,
              allowing multiple hosts to activate the LV concurrently.
              Before activating the LV, the command uses lvmlockd to acquire
              a shared lock on the LV.  If the lock cannot be acquired, the
              LV is not activated and an error is reported.  This would
              happen if the LV is active exclusively on another host.  If
              the LV type prohibits shared access, such as a snapshot, the
              command will report an error and fail.

              With -an, the command deactivates the LV on the host running
              the command.  After deactivating the LV, the command uses
              lvmlockd to release the current lock on the LV.

              With lvmlockd, an unspecified mode is always exclusive, -ay
              defaults to -aey.

       --activationmode {complete|degraded|partial}
              The activation mode determines whether logical volumes are
              allowed to activate when there are physical volumes missing
              (e.g. due to a device failure).  complete is the most
              restrictive; allowing only those logical volumes to be
              activated that are not affected by the missing PVs.  degraded
              allows RAID logical volumes to be activated even if they have
              PVs missing.  (Note that the "mirror" segment type is not
              considered a RAID logical volume.  The "raid1" segment type
              should be used instead.)  Finally, partial allows any logical
              volume to be activated even if portions are missing due to a
              missing or failed PV.  This last option should only be used
              when performing recovery or repair operations.  degraded is
              the default mode.  To change it, modify activation_mode in

       -K, --ignoreactivationskip
              Ignore the flag to skip Logical Volumes during activation.

       -c, --clustered {y|n}
              If clustered locking is enabled, this indicates whether this
              Volume Group is shared with other nodes in the cluster or
              whether it contains only local disks that are not visible on
              the other nodes.  If the cluster infrastructure is unavailable
              on a particular node at a particular time, you may still be
              able to use Volume Groups that are not marked as clustered.

              Detach any metadata configuration profiles attached to given
              Volume Groups. See lvm.conf(5) for more information about
              metadata profiles.

       -u, --uuid
              Generate new random UUID for specified Volume Groups.

       --monitor {y|n}
              Start or stop monitoring a mirrored or snapshot logical volume
              with dmeventd, if it is installed.  If a device used by a
              monitored mirror reports an I/O error, the failure is handled
              according to mirror_image_fault_policy and
              mirror_log_fault_policy set in lvm.conf(5).

       --poll {y|n}
              Without polling a logical volume's backgrounded transformation
              process will never complete.  If there is an incomplete pvmove
              or lvconvert (for example, on rebooting after a crash), use
              --poll y to restart the process from its last checkpoint.
              However, it may not be appropriate to immediately poll a
              logical volume when it is activated, use --poll n to defer and
              then --poll y to restart the process.

              Indicates that vgchange(8) is being invoked from early system
              initialisation scripts (e.g. rc.sysinit or an initrd), before
              writeable 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
              LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES environment variable.

              If --sysinit is used in conjunction with lvmetad(8) enabled
              and running, autoactivation is preferred over manual
              activation via direct vgchange call.  Logical volumes are
              autoactivated according to auto_activation_volume_list set in

              Disable udev synchronisation. The process will not wait for
              notification from udev.  It will continue irrespective of any
              possible udev processing in the background.  You should only
              use this if udev is not running or has rules that ignore the
              devices LVM2 creates.

              Make no attempt to interact with dmeventd unless --monitor is
              specified.  Do not use this if dmeventd is already monitoring
              a device.

              Start the lockspace of a shared VG in lvmlockd.  lvmlockd
              locks becomes available for the VG, allowing LVM to use the
              VG.  See lvmlockd(8).

              Stop the lockspace of a shared VG in lvmlockd.  lvmlockd locks
              become unavailable for the VG, preventing LVM from using the
              VG.  See lvmlockd(8).

       --lock-type LockType
              Change the VG lock type to or from a shared lock type used
              with lvmlockd.  See lvmlockd(8).

       -l, --logicalvolume MaxLogicalVolumes
              Changes the maximum logical volume number of an existing
              inactive volume group.

       -p, --maxphysicalvolumes MaxPhysicalVolumes
              Changes the maximum number of physical volumes that can belong
              to this volume group.  For volume groups with metadata in lvm1
              format, the limit is 255.  If the metadata uses lvm2 format,
              the value 0 removes this restriction: there is then no limit.
              If you have a large number of physical volumes in a volume
              group with metadata in lvm2 format, for tool performance
              reasons, you should consider some use of --pvmetadatacopies 0
              as described in pvcreate(8), and/or use --vgmetadatacopies.

       --metadataprofile ProfileName
              Uses and attaches ProfileName configuration profile to the
              volume group metadata. Whenever the volume group is processed
              next time, the profile is automatically applied. The profile
              is inherited by all logical volumes in the volume group unless
              the logical volume itself has its own profile attached. See
              lvm.conf(5) for more information about metadata profiles.

       --[vg]metadatacopies NumberOfCopies|unmanaged|all
              Sets the desired number of metadata copies in the volume
              group.  If set to a non-zero value, LVM will automatically
              manage the 'metadataignore' flags on the physical volumes (see
              pvchange or pvcreate --metadataignore) in order to achieve
              NumberOfCopies copies of metadata.  If set to unmanaged, LVM
              will not automatically manage the 'metadataignore' flags.  If
              set to all, LVM will first clear all of the 'metadataignore'
              flags on all metadata areas in the volume group, then set the
              value to unmanaged.  The vgmetadatacopies option is useful for
              volume groups containing large numbers of physical volumes
              with metadata as it may be used to minimize metadata read and
              write overhead.

       -s, --physicalextentsize PhysicalExtentSize[BbBsSkKmMgGtTpPeE]
              Changes the physical extent size on physical volumes of this
              volume group.  A size suffix (k for kilobytes up to t for
              terabytes) is optional, megabytes is the default if no suffix
              is present.  For LVM2 format, the value must be a power of 2
              of at least 1 sector (where the sector size is the largest
              sector size of the PVs currently used in the VG) or, if not a
              power of 2, at least 128KiB.  For the older LVM1 format, it
              must be a power of 2 of at least 8KiB.  The default is 4 MiB.

              Before increasing the physical extent size, you might need to
              use lvresize, pvresize and/or pvmove so that everything fits.
              For example, every contiguous range of extents used in a
              logical volume must start and end on an extent boundary.

              If the volume group metadata uses lvm1 format, extents can
              vary in size from 8KiB to 16GiB and there is a limit of 65534
              extents in each logical volume.  The default of 4 MiB leads to
              a maximum logical volume size of around 256GiB.

              If the volume group metadata uses lvm2 format those
              restrictions do not apply, but having a large number of
              extents will slow down the tools but have no impact on I/O
              performance to the logical volume.  The smallest PE is 1KiB.

              The 2.4 kernel has a limitation of 2TiB per block device.

       --systemid SystemID
              Changes the system ID of the VG.  Using this option requires
              caution because the VG may become foreign to the host running
              the command, leaving the host unable to access it.  See

              If any logical volume in the volume group is active, reload
              its metadata.  This is not necessary in normal operation, but
              may be useful if something has gone wrong or if you're doing
              clustering manually without a clustered lock manager.

       -x, --resizeable {y|n}
              Enables or disables the extension/reduction of this volume
              group with/by physical volumes.

Examples         top

       To activate all known volume groups in the system:

       vgchange -a y

       To change the maximum number of logical volumes of inactive volume
       group vg00 to 128.

       vgchange -l 128 /dev/vg00

SEE ALSO         top

       lvchange(8), lvm(8), vgcreate(8)

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, send it to  This page was obtained
       from the project's upstream Git repository 
       ⟨⟩ on 2017-03-13.  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

Sistina Software UKLVM TOOLS 2.02.169(2)-git (2016-11-30)        VGCHANGE(8)