VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Chapter 4, Creating and Administering Disk Groups
Reorganizing the Contents of Disk Groups
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by another host or because it no longer exists, you must recover the disk group manually
as described in the section “Recovery from Incomplete Disk Group Moves” in the chapter
“Recovery from Hardware Failure” of the VERITAS Volume Manager Troubleshooting Guide.
The disk group move, 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 133 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.
◆ 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 snapobjects 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 adisk groupsplit to succeed, boththe sourceand target disk groups mustcontain
at least one disk that can store copies of the configuration database after the split.
◆ For adisk group move or join tosucceed, theconfiguration databasein 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 acluster environment,disk groupsinvolved in a moveor join mustboth be private
or must both be shared.
The following sections describe how to use thevxdg command toreorganize disk groups.
For more information about the vxdg command, see the vxdg(1M) manual page.