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| gunter |
 Posted: Thu Jan 19, 2006 5:31 am Post subject: MQ failover with SAN |
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Partisan
Joined: 21 Jan 2004
Posts: 307
Location: Germany, Frankfurt
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Hi,
our admin plans to realise a failover with cold standby. Both systems are identical and the failoversystem starts with the same network configuration. The idea is to put the /var/mqm on a SAN drive.
Is ther something wrong with this solution? I read it is better only to put the queuemanager directory on SAN.
Thanks in advance
Gunter
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Gunter Jeschawitz
IBM Certified System Administrator - Websphere MQ, 5.3 |
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| mvic |
| Posted: Thu Jan 19, 2006 8:17 am Post subject: Re: MQ failover with SAN |
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Jedi
Joined: 09 Mar 2004
Posts: 2080
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| gunter |
| Posted: Mon Jan 23, 2006 6:46 am Post subject: |
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Partisan
Joined: 21 Jan 2004
Posts: 307
Location: Germany, Frankfurt
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Hi,
many thanks for this hint. I read it , but we don't have HACMP.
I know, if it happends and both queumanagers are runnung at the same time, the result is disastrous.
My question is:
Is it possible to put /var/mqm on SAN and start after shutdown or crash a second machine with identical configuration, mount /var/mqm and start the queumanager.
Is ther any machine depended information in /var/mqm ?
( p.e. references to inodes, hostid, ... )
Thanks
Gunter
_________________
Gunter Jeschawitz
IBM Certified System Administrator - Websphere MQ, 5.3 |
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| mvic |
| Posted: Mon Jan 23, 2006 12:11 pm Post subject: |
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Jedi
Joined: 09 Mar 2004
Posts: 2080
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| What OS are you thinking of using for the two nodes? |
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| vennela |
| Posted: Mon Jan 23, 2006 1:56 pm Post subject: |
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Jedi Knight
Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India
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| gunter wrote: |
Is ther any machine depended information in /var/mqm ?
( p.e. references to inodes, hostid, ... )
Thanks
Gunter |
IP addresses, for connames of RCVR channels. |
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| gunter |
| Posted: Mon Jan 23, 2006 11:05 pm Post subject: |
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Partisan
Joined: 21 Jan 2004
Posts: 307
Location: Germany, Frankfurt
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The OS is AIX 5.3, the network configuration (IP address, name, ... ) is identical. The second machine will be running only if the first is down.
I'm quite sure it works, but even if it works when we try it, it's not proven that it is ok. If there is any point wrong it may not work after the next CSD.
Thanks
Gunter
_________________
Gunter Jeschawitz
IBM Certified System Administrator - Websphere MQ, 5.3 |
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| mvic |
| Posted: Tue Jan 24, 2006 2:14 am Post subject: |
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Jedi
Joined: 09 Mar 2004
Posts: 2080
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| gunter wrote: |
| The OS is AIX 5.3 |
Then I think IBM's suggested approach will be that contained in http://www.ibm.com/support/docview.wss?uid=swg24006416 - ie. using HACMP.
If you can't use HACMP then it is still worth looking into the document at that URL to see the principles that are being used. Actually I had think the questions you ask:
| Quote: |
Is it possible to put /var/mqm on SAN and start after shutdown or crash a second machine with identical configuration, mount /var/mqm and start the queumanager.
Is ther any machine depended information in /var/mqm ?
( p.e. references to inodes, hostid, ... ) |
are answered in that document.
Anyway, given that I personally don't have experience of running HACMP (or similar) environment I can't reliably comment on your wish to do this without HACMP. Perhaps you could raise a requirement with your IBM account team, or a support call, to see if a non-HACMP solution is available for AIX? |
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| markt |
| Posted: Tue Jan 24, 2006 5:29 am Post subject: |
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Knight
Joined: 14 May 2002
Posts: 508
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To do a reliable failover, you have to have
a) a resource monitor (is MQ running?)
b) a way to GUARANTEE disks are not accessible from the failed machine (so that a semi-failed qmgr is not still trying to write to the files)
c) something to switch IP addresses
d) something to start applications and resources on the standby machine
e) something to monitor other resources like databases that might be
running
f) status reporting
g) a management interface to control the failover (eg disable failover during upgrades)
And by the time you've done all that, you've reinvented HACMP/Veritas etc and probably done it worse. So why not save the hassle and use a properly supported HA product. |
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| csaunders |
| Posted: Tue Jan 24, 2006 9:44 am Post subject: Re: MQ failover with SAN |
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Acolyte
Joined: 27 Mar 2003
Posts: 64
Location: Arlington, Va
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holly cow, the versions of these are so old, 5.8 and Veritas 1.3. MQ 5.1.
Does anyone use this support pac on MQ 5.3 on Solaris 5.9 running CFS 4.1? Seems like this is useless for the new versions. |
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