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Operating Systems AIX PowerHA(HACMP) full vg loss - cluster hangs on release_vg_fs event Post 302791797 by vilius on Tuesday 9th of April 2013 08:00:58 AM
Old 04-09-2013
PowerHA(HACMP) full vg loss - cluster hangs on "release_vg_fs" event

Hello,

AIX 6.1 TL7 SP6
POwerHA 6.1 SP10

I was experimenting with new hacmp build. It's 3-node cluster build on AIX 6.1 lpars. It contains Ethernet and diskhb networks. Shared vg disk is SAN disk. Two nodes see disk using vscsi, third node sees disk using npiv. Application is db2 server.

Most accidents usually involve some kind of network failure - so I decided to test my cluster against Ethernet failure and SAN failure. Ethernet failure test was successful - when node lost Ethernet connectivity(both cables of course) my resource group jumped to next node with no problem.

Next I did SAN failure test:
I did it in 2 different ways by removing vsci mapping in vios or by removing fcs mapping in vios(npiv case) - results were exactly the same in both cases - cluster reacted correctly and started release_vg_fs event, release_vg_fs script tried to unmount filesystems but since all fs disk devices were gone script just hung, and cluster started issuing config_too_long events..
So clstat reports resouce group as "RELEASING.." and that's it...

How do I configure PowerHA to handle full vg loss(for example SAN down causes that) correctly ??

thanks,
Vilius M.

Last edited by vilius; 04-09-2013 at 09:17 AM..
 

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PACEMAKER(8)						  System Administration Utilities					      PACEMAKER(8)

NAME
Pacemaker - Part of the Pacemaker cluster resource manager SYNOPSIS
crm_node command [options] DESCRIPTION
crm_node - Tool for displaying low-level node information OPTIONS
-?, --help This text -$, --version Version information -V, --verbose Increase debug output -Q, --quiet Essential output only Stack: -A, --openais Only try connecting to an OpenAIS-based cluster -H, --heartbeat Only try connecting to a Heartbeat-based cluster Commands: -e, --epoch Display the epoch during which this node joined the cluster -q, --quorum Display a 1 if our partition has quorum, 0 if not -l, --list Display all known members (past and present) of this cluster (Not available for heartbeat clusters) -p, --partition Display the members of this partition -i, --cluster-id Display this node's cluster id -R, --remove=value (Advanced, AIS-Only) Remove the (stopped) node with the specified nodeid from the cluster Additional Options: -f, --force AUTHOR
Written by Andrew Beekhof REPORTING BUGS
Report bugs to pacemaker@oss.clusterlabs.org Pacemaker 1.1.7 April 2012 PACEMAKER(8)
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