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|--available [e|l] {y|n}] [--monitor {y|n}] [--poll {y|n}]
       [-c|--clustered {y|n}] [-u|--uuid]  [-d|--debug]  [--deltag  Tag]  [-h|--help]  [--ignorelockingfailure]  [--ignoremonitoring]  [--sysinit]
       [--noudevsync]   [-l|--logicalvolume   MaxLogicalVolumes]  [-p|--maxphysicalvolumes  MaxPhysicalVolumes]  [--[vg]metadatacopies]  NumberOf-
       Copies|unmanaged|all] [-P|--partial] [-s|--physicalextentsize PhysicalExtentSize[bBsSkKmMgGtTpPeE]] [--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 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  volumes
              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}
              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  write-
              able 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.

       --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  cre-
              ates.

       --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 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  for-
              mat, 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.

       --[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 vgmetadata-
              copies  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[bBsSkKmMgGtTpPeE]
              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.  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 logical volume.  The smallest PE is 1KB.

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

       --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 2.02.95(2) (2012-03-06)                                             VGCHANGE(8)