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Operating Systems AIX Rebooting redundant VIOs and mirroring of PVs they serve to client LPARs Post 302968200 by MichaelFelt on Saturday 5th of March 2016 04:52:42 AM
Old 03-05-2016
What was not clear to me is whether the storage was physically located.

It sounds like it was using local storage (local, i.e., physical, not from a SAN) and the LPAR (aka virtual machine) was using LVM mirroring.

This was the preferred (read almost only) solution in 2005 before SAN storage was common. HOWEVER, if you have SAN backed storage what is 'common' when you have local (i.e., in the CEC aka Compute node) storage is to use the local storage for rootvg, dvd repositories, secure logs, etc. and SAN and MPIO for hosting VM (or client LPAR) storage.

re: active/passive LVM mirroring: the consistency check was to help 'guess' which mirror was last written when recovering from a crash. In your case, while the VIOS was down, one path was down and it is clear which disk is stale and needs to be synced.

Over time, the disks will sync automatically - but you can speed the process by running syncvg (lsvg vgName will tell you if there are stale disks and if so, how many stale PP)
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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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