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| Linux MQ file system |
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| jchype |
 Posted: Mon Nov 17, 2003 9:55 pm Post subject: Linux MQ file system |
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Newbie
Joined: 12 Jun 2002
Posts: 8
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In the quick beginning guide for Linux, in the Creating WebSphere MQ file system, Creating separate file systems for working data it states:
If you create separate file systems:
The /var/mqm and /var/mqm/log directories must be on a local file system.
The /var/mqm/errors directory can be NFS mounted.
Would you explain what the limitation for why the /var/mqm and the /var/mqm/log directories must be on the local file system? Based on testing WMQ seems to work and with that in mind is the restriction still valid.
Thanks for the information. |
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| JasonE |
| Posted: Tue Nov 18, 2003 2:00 am Post subject: |
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Grand Master
Joined: 03 Nov 2003
Posts: 1220
Location: Hursley
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<partical guess>
Certainly on other platforms we only support local logs because the write to the logs is critical. We use o/s options to ensure writethrough (ie not cached) and wait for completion in certain circumstances and we rely on the fact that they are honoured. When you start having non-local file systems, they dont necessarily match these sematics and may appear to honour but not do so.
</partial guess> |
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| bower5932 |
| Posted: Tue Nov 18, 2003 6:03 am Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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| I've heard that it was done because of performance reasons as well. By moving the critical MQ files to non-local file systems, it had a negative impact on MQ performance. |
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| mrlinux |
| Posted: Tue Nov 18, 2003 10:13 am Post subject: |
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Grand Master
Joined: 14 Feb 2002
Posts: 1261
Location: Detroit,MI USA
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Well the local filesystem can be a external disk array if that is what you are wondering about.
_________________
Jeff
IBM Certified Developer MQSeries
IBM Certified Specialist MQSeries
IBM Certified Solutions Expert MQSeries |
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