Provided by: lvm2_2.02.133-1ubuntu10_amd64 bug

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|--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]]
       [-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 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

       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
              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 possible:

              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 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 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_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.

       --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_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 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 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
              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)