Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

189Creating and administering disk groups
Reorganizing the contents of disk groups
Limitations of disk group split and join
The disk group split and join feature has the following limitations:
■ Disk groups involved in a move, split or join must be version 90 or greater. See
“Upgrading a disk group” on page 198 for more information on disk group versions.
■ The reconfiguration must involve an integral number of physical disks.
■ Objects to be moved must not contain open volumes.
■ Disks cannot be moved between CDS and non-CDS compatible disk groups.
■ Moved volumes are initially disabled following a disk group move, split or join. Use
the
vxrecover -m and vxvol startall commands to recover and restart the
volumes.
■ Data change objects (DCOs) and snap objects that have been dissociated by
Persistent FastResync cannot be moved between disk groups.
■ Veritas Volume Replicator (VVR) objects cannot be moved between disk groups.
■ For a disk group move to succeed, the source disk group must contain at least one
disk that can store copies of the configuration database after the move.
■ For a disk group split to succeed, both the source and target disk groups must contain
at least one disk that can store copies of the configuration database after the split.
■ For a disk group move or join to succeed, the configuration database in the target disk
group must be able to accommodate information about all the objects in the enlarged
disk group.
■ Splitting or moving a volume into a different disk group changes the volume’s record
ID.
■ The operation can only be performed on the master node of a cluster if either the
source disk group or the target disk group is shared.
■ In a cluster environment, disk groups involved in a move or join must both be private
or must both be shared.
■ When used with objects that have been created using the Veritas Intelligent Storage
Provisioning (ISP) feature, only complete storage pools may be split or moved from a
disk group. Individual objects such as application volumes within storage pools may
not be split or moved. See the Veritas Storage Foundation Intelligent Storage
Provisioning Administrator’s Guide for a description of ISP and storage pools.
■ If a cache object or volume set that is to be split or moved uses ISP volumes, the
storage pool that contains these volumes must also be specified.
The following sections describe how to use the vxdg command to reorganize disk groups.
For more information about the
vxdg command, see the vxdg(1M) manual page.