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Full Discussion: Volume Groups and the SAN
Operating Systems AIX Volume Groups and the SAN Post 302174233 by bakunin on Monday 10th of March 2008 12:30:32 PM
Old 03-10-2008
This is just an assumption: every volume group has a "quorum" - the number of disks which have to be there so that the system assumes the volume group to be ok despite maybe disks missing. If you have extended the VG the system may have increased the quorum and may have not decreased it when you reduced the VG.

Issue "chvg -Qn <vgname>" to require no quorum to keep the VG online.

I hope this helps.

bakunin
 

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mkqdisk(8)						      Quorum Disk Management							mkqdisk(8)

NAME
mkqdisk - Cluster Quorum Disk Utility WARNING
Use of this command can cause the cluster to malfunction. SYNOPSIS
mkqdisk [-?|-h] | [-L] | [-f label] [-c device -l label] [-d [-d ...]] DESCRIPTION
The mkqdisk command is used to create a new quorum disk or display existing quorum disks accessible from a given cluster node. OPTIONS
-c device -l label Initialize a new cluster quorum disk. This will destroy all data on the given device. If a cluster is currently using that device as a quorum disk, the entire cluster will malfunction. Do not run this on an active cluster when qdiskd is running. Only one device on the SAN should ever have the given label; using multiple different devices is currently not supported (it is expected a RAID array is used for quorum disk redundancy). The label can be any textual string up to 127 characters - and is therefore enough space to hold a UUID created with uuidgen(1). -f label Find the cluster quorum disk with the given label and display information about it. -L Display information on all accessible cluster quorum disks. -d Increase debugging level. Specify multiple times for more information. Currently, specifying more than twice has no effect. SEE ALSO
qdisk(5), qdiskd(8), uuidgen(1) July 2006 mkqdisk(8)
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