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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|--available [e|l] {y|n}] [--monitor {y|n}] [-c|--clustered
       {y|n}] [-u|--uuid] [-d|--debug] [--deltag Tag] [-h|--help]
       [--ignorelockingfailure] [--ignoremonitoring] [-l|--logicalvolume
       MaxLogicalVolumes] [-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
       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}
              Controls whether or not a mirrored logical volume is monitored
              by 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).

       --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
              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
              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.

       -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)