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| How do you calculate Q Mgr data and log disk space? |
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| rmbowma |
 Posted: Thu Jan 08, 2009 7:26 pm Post subject: How do you calculate Q Mgr data and log disk space? |
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Apprentice
Joined: 24 Mar 2005
Posts: 28
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| I'm installing MQ V7 on an iSeries and AIX machine. I need to calculate how much disk space to allocate to hold my queues and logs. Where can I find this information or can someone tell me how to do this? |
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| fjb_saper |
| Posted: Thu Jan 08, 2009 9:03 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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You use traffic estimates, traffic types, top it off by a growth amount, double the growth amount and use common sense like average message size, max message size, max qdepth etc... This should give a feel for the log size you are shooting for. Remember concurrency of messages will play as well...
On the other hand, you can shoot for the max disc space you can get/afford for them... and remember disc is cheap....
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| bruce2359 |
| Posted: Fri Jan 09, 2009 8:26 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9470
Location: US: west coast, almost. Otherwise, enroute.
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Take a look at WMQ System Admin manual (midrange). It has narrative on sizing logs. WMQ Plannaing manual (z/OS), too.
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Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| zpat |
| Posted: Fri Jan 09, 2009 8:54 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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Logs (circular at least) only holds certain data related to active syncpoints.
You need to understand how (or even if) your applications commit their units of work.
Here are my rough guidelines
maybe have 5 primary and 5 secondary
definitely set LogFilePages to 16384
Use circular logging (in most cases)
Make sure the disk space will allow the use of the above log files.
Make sure the queue space has enough space for a weeks worth of messages at least
Round up to nearest GB.
Make sure the Dead Letter Queue is defined and has a very large max depth (eg 500000)
Make sure transmit queues have a large max depth (eg 50000) |
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| bruce2359 |
| Posted: Fri Jan 09, 2009 9:01 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9470
Location: US: west coast, almost. Otherwise, enroute.
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| Quote: |
| You need to understand how (or even if) your applications commit their units of work. |
And your application developers must understand that their applications cannot create very large units of work (either individually or in combination with other concurrent applications) that may/could/might span all circular log segments.
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I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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