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Full Discussion: PowerHA(HACMP) full vg loss - cluster hangs on release_vg_fs event
Operating Systems AIX PowerHA(HACMP) full vg loss - cluster hangs on release_vg_fs event Post 302792837 by vilius on Thursday 11th of April 2013 05:20:57 AM
Old 04-11-2013
Hi,

Thanks for reply.

I just want to clarify some details about my problem:

I'm talking about vg_loss(SAN_down/vscsi_down/npiv_down) only on single node - other nodes see SAN disks with no problem.
vscsi and npiv mixing is only for test purposes.
The problem is not error but hung release_vg_fs event script and to be specific it's "umount -f .." command which hangs - I see that using ps during the event. I tried removing all app processes using fuser in my app server script - it doesn't help - umount still hangs. The same problem is evident even without cluster, just using manual administration commands: all vg devices gone - umount will never return. My problem could be simplified as: how do I umount fs then it's vg and devices are gone?

Only solution I see now is node shutdown on some event(I did not decide which one yet), shutdown never finishes because of hung umounts but node releases resource group - and that is enough. If someone could suggest smarter solution please do.

On the other hand it's standard situation and people who test their cluster against "SAN down on single node" should face the same situation.

Vilius M.
Last edited by vilius; 04-11-2013 at 06:28 AM..
 

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LEARN ABOUT DEBIAN

mkqdisk

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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