VGCHANGE(8)                                                        VGCHANGE(8)



NAME
       vgchange - change attributes of a volume group

SYNOPSIS
       vgchange  [--addtag  Tag]  [--alloc  AllocationPolicy] [-A|--autobackup
       {y|n}] [-a|--available [e|l] {y|n}] [--monitor  {y|n}]  [-c|--clustered
       {y|n}]  [-u|--uuid]  [-d|--debug] [--deltag Tag] [-h|--help] [--ignore-
       lockingfailure] [--ignoremonitoring] [-l|--logicalvolume MaxLogicalVol-
       umes]   [-p|--maxphysicalvolumes   MaxPhysicalVolumes]   [-P|--partial]
       [-s|--physicalextentsize   PhysicalExtentSize[kKmMgGtT]]    [-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 VolumeGroup-
       Name, or all volume groups if none is specified.   Only  active  volume
       groups  are  subject  to changes and allow access to their logical vol-
       umes.   [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  administra-
       tor that such snapshots should be removed (see lvremove(8)).  ]

OPTIONS
       See lvm for common options.

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

       -a, --available [e|l]{y|n}
              Controls the availability of the logical volumes in  the  volume
              group  for input/output.  In other words, makes the logical vol-
              umes known/unknown to the kernel.

              If clustered locking is enabled, add 'e' to  activate/deactivate
              exclusively  on  one  node or 'l' to activate/deactivate only on
              the local node.  Logical volumes with single-host snapshots  are
              always  activated  exclusively  because they can only be used on
              one node at once.

       -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.

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

       --monitor {y|n}
              Controls  whether  or not a mirrored logical volume is monitored
              by dmeventd, if it is installed.  If a device used  by  a  moni-
              tored  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).

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

       -l, --logicalvolume MaxLogicalVolumes
              Changes  the  maximum logical volume number of an existing inac-
              tive 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 --metadatacopies 0 as  described  in
              pvcreate(8).

       -s, --physicalextentsize PhysicalExtentSize[kKmMgGtT]
              Changes  the  physical  extent  size on physical volumes of this
              volume group.  A size suffix (k for kilobytes up to t  for  ter-
              abytes)  is  optional,  megabytes is the default if no suffix is
              present.  The default is 4 MB and it must be at least 1 KB and a
              power of 2.

              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 8KB to 16GB and there is a limit of 65534 extents
              in each logical volume.  The default of 4 MB leads to a  maximum
              logical volume size of around 256GB.

              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 log-
              ical volume.  The smallest PE is 1KB.

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

       -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 2.02.44-cvs (02-17-09)            VGCHANGE(8)

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