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

185Creating and administering disk groups
Reorganizing the contents of disk groups
c2t8d0( c2t8d0 ) || 0.1 || 0.0 ssb ids don’t match
Please note that even though some disks ssb ids might match
that does not necessarily mean that those disks’ config copies
have all the changes. From some other configuration copies,
those disks’ ssb ids might not match.
To see the configuration from this disk, run
/etc/vx/diag.d/vxprivutil dumpconfig /dev/vx/dmp/c2t6d0
Based on your knowledge of how the serial split brain condition came about, you must
choose one disk’s configuration to be used to import the disk group. For example, the
following command imports the disk group using the configuration copy that is on side 0
of the split:
# /usr/sbin/vxdg -o selectcp=1045852127.32.olancha import newdg
When you have selected a preferred configuration copy, and the disk group has been
imported, VxVM resets the serial IDs to 0 for the imported disks. The actual and expected
serial IDs for any disks in the disk group that are not imported at this time remain
unaltered.
Reorganizing the contents of disk groups
Note: You need a Veritas FlashSnap
TM
license to use this feature.
There are several circumstances under which you might want to reorganize the contents of
your existing disk groups:
■ To group volumes or disks differently as the needs of your organization change. For
example, you might want to split disk groups to match the boundaries of separate
departments, or to join disk groups when departments are merged.
■ To reduce the size of a disk group’s configuration database in the event that its private
region is nearly full. This is a much simpler solution than the alternative of trying to
grow the private region.
■ To perform online maintenance and upgrading of fault-tolerant systems that can be
split into separate hosts for this purpose, and then rejoined.
■ To isolate volumes or disks from a disk group, and process them independently on
the same host or on a different host. This allows you to implement off-host
processing solutions for the purposes of backup or decision support. This is discussed
further in “Configuring off-host processing” on page 361.
You can use either the Veritas Enterprise Administrator (VEA) or the
vxdg command to
reorganize your disk groups. For more information about using the graphical user
interface, see the Veritas Enterprise Administrator User’s Guide and VEA online help.
This section describes how to use the
vxdg command.
The
vxdg command provides the following operations for reorganizing disk groups: