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

NAME
       vgchange — change attributes of a volume group

SYNOPSIS
       vgchange  [--addtag Tag] [--alloc AllocationPolicy] [-A|--autobackup {y|n}] [-a|--activate
       [a|e|s|l] {y|n}]  [--activationmode  {complete|degraded|partial}]  [-K|--ignoreactivation‐
       skip]  [--monitor  {y|n}] [--poll {y|n}] [-c|--clustered {y|n}] [-u|--uuid] [--commandpro‐
       file ProfileName] [-d|--debug] [--deltag Tag] [--detachprofile] [-h|--help] [--ignorelock‐
       ingfailure]   [--ignoremonitoring]   [--ignoreskippedcluster]  [--sysinit]  [--noudevsync]
       [--lock-start] [--lock-stop] [--lock-type LockType] [-l|--logicalvolume MaxLogicalVolumes]
       [-p|--maxphysicalvolumes  MaxPhysicalVolumes] [--metadataprofile ProfileName] [--[vg]meta‐
       datacopies] NumberOfCopies|unmanaged|all] [-P|--partial]  [-s|--physicalextentsize  Physi‐
       calExtentSize[bBsSkKmMgGtTpPeE]] [-S|--select Selection] [--systemid SystemID] [--refresh]
       [-t|--test] [-v|--verbose] [--version] [-x|--resizeable {y|n}] [VolumeGroupName...]

DESCRIPTION
       vgchange allows you to change the attributes of one or more volume groups. Its  main  pur‐
       pose is to activate and deactivate VolumeGroupName, or all volume groups if none is speci‐
       fied.  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 lvre‐
       move(8)).  ]

OPTIONS
       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/out‐
              put.  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 acti‐
              vation.  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/Logi‐
              calVolumeName  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 pos‐
              sible:

              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 exclusive.

              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, and the following options are  possi‐
              ble:

              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 host.

              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  exclu‐
              sively  on  another  host.  If the LV type prohibits shared access, such as a snap‐
              shot, 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 consid‐
              ered  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 lvm.conf(5).

       -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.

       --detachprofile
              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_pol‐
              icy 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.  How‐
              ever, 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.

       --sysinit
              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_LOCK‐
              ING_FAILURE_MESSAGES environment variable.

              If --sysinit is used in conjunction with lvmetad(8) enabled and running,  autoacti‐
              vation  is preferred over manual activation via direct vgchange call.  Logical vol‐
              umes are autoactivated according to auto_activation_volume_list set in lvm.conf(5).

       --noudevsync
              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.

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

       --lock-start
              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).

       --lock-stop
              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 lvm‐
              lockd(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 meta‐
              data  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 physi‐
              cal volumes (see pvchange or pvcreate --metadataignore) in order  to  achieve  Num‐
              berOfCopies  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  con‐
              taining  large numbers of physical volumes with metadata as it may be used to mini‐
              mize 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, pvre‐
              size 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 lvmsystemid(7).

       --refresh
              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
       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
       lvchange(8), lvm(8), vgcreate(8)

Sistina Software UK             LVM TOOLS 2.02.133(2) (2015-10-30)                    VGCHANGE(8)

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