Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Chapter 4, Creating and Administering Disk Groups
Reorganizing the Contents of Disk Groups
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You can specify the -c option to vxsplitlines to print detailed information about each
of the disk IDs from the configuration copy on a disk specified by its disk access name:
# vxsplitlines -g newdg -c c2t6d0
DANAME(DMNAME) || Actual SSB || Expected SSB
c2t5d0( c2t5d0 ) || 0.1 || 0.0 ssb ids don’t match
c2t6d0( c2t6d0 ) || 0.1 || 0.1 ssb ids match
c2t7d0( c2t7d0 ) || 0.1 || 0.1 ssb ids match
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.