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Full Discussion: Cluster failure reason
Operating Systems AIX Cluster failure reason Post 302885312 by zaxxon on Friday 24th of January 2014 02:29:35 PM
Old 01-24-2014
The backbone of the highavailability is the nodes in a cluster checking each other so you should look into heartbeats. They are usually implemented by sharing a disk space, like a concurrent accessable VG, which is rather small and have the nodes write in there some bits and by the freshness of it the nodes can decide who is still up and alive.
Additionally there is heartbeating via network interfaces. Some even use or used serial interfaces etc.
This is an important part of HACMP/PowerHA and other Cluster Technologies.

Have a look here:
Heartbeating in HACMP - AIX 6.1 Information Center
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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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