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| MHRahaman |
 Posted: Thu Dec 22, 2005 11:28 am Post subject: Can file systems be shared in MQ Clustering |
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Novice
Joined: 22 Dec 2005
Posts: 14
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| Can file system (/var/mqm) be shared in MQ Cluster from different machines. I am thinking it is "NO" but want to be sure. Does any one came across this issue ? Please share your experience, Thanks |
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| fjb_saper |
| Posted: Thu Dec 22, 2005 11:37 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Only in a HACMP environment (i.e. Hardware clustering)
Enjoy  |
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| MHRahaman |
| Posted: Thu Dec 22, 2005 12:03 pm Post subject: Can file systems be shared in MQ Clustering |
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Novice
Joined: 22 Dec 2005
Posts: 14
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| What will happen if you mount the same /var/mqm file system on both the systems ? |
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| jefflowrey |
| Posted: Thu Dec 22, 2005 12:06 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Have you tried it?
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I am *not* the model of the modern major general. |
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| MHRahaman |
| Posted: Thu Dec 22, 2005 12:21 pm Post subject: Can file systems be shared in MQ Clustering |
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Novice
Joined: 22 Dec 2005
Posts: 14
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| No, I haven't tried yet. I am in Planning/designing stage. I am trying to find which route to take if I have an option, |
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| xxx |
| Posted: Tue Dec 27, 2005 3:59 pm Post subject: |
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Centurion
Joined: 13 Oct 2003
Posts: 137
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You cannot mount /var/mqm or for that reason any FS on both systems at same time.
You can create two shared FS one mounted on Each system at a time,and if there is a failure it can be moved to the other , |
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| sunnybab |
| Posted: Fri Jan 20, 2006 4:12 pm Post subject: |
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Novice
Joined: 12 Jan 2006
Posts: 21
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| You can have NFS File System from contact admin Storage mounted on both systems simutaneously. |
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| wschutz |
| Posted: Mon Jan 23, 2006 5:34 am Post subject: |
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Jedi Knight
Joined: 02 Jun 2005
Posts: 3316
Location: IBM (retired)
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| sunnybab wrote: |
| You can have NFS File System from contact admin Storage mounted on both systems simutaneously. |
humm...I didn't think we allowed the /var/mqm/log directory to be an NFS mount 
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-wayne |
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| mvic |
| Posted: Mon Jan 23, 2006 6:03 am Post subject: |
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Jedi
Joined: 09 Mar 2004
Posts: 2080
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| wschutz wrote: |
| sunnybab wrote: |
| You can have NFS File System from contact admin Storage mounted on both systems simutaneously. |
humm...I didn't think we allowed the /var/mqm/log directory to be an NFS mount |
Right, and the results from sharing a single qmgr's data over two running instances of the qmgr are not worth thinking about. Data corruption would probably occur immediately.
HACMP / failover methods only work if there is guaranteed to be only one running instance of a queue manager using the same queue manager's data in /var/mqm. |
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| zpat |
| Posted: Mon Jan 23, 2006 6:18 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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MSCS clustering with shared (SAN) disks works fine as well.
A given queue manager should be active/passive, but there is no reason why you can't have a different queue manager active on the other side of the cluster.
The shared file system can be online to both sides of the cluster at the same time, but of course a given queue manager must run on one side or the other. |
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| alvinlimtc |
| Posted: Sun Jan 29, 2006 6:44 pm Post subject: |
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Apprentice
Joined: 22 Dec 2005
Posts: 29
Location: Singapore
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Create a seperate mount point for each QM, eg /MQHA/<QMgr Name>/data. Then create a softlink from the local directory /var/mqm/qmgrs/<Qmgr Name> to the shared directory.
This is a much cleaner approach.
Take a look at Support Pack MC6A for more information. |
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