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| Adding MQ logs on AIX |
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| pfarrel |
 Posted: Fri Jul 29, 2005 5:16 am Post subject: Adding MQ logs on AIX |
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Centurion
Joined: 16 Mar 2004
Posts: 120
Location: Kansas City
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I have 3 queue managers on one AIX lpar. I tried to add log datasets to one of them, but it didn't seem to work.
I updated the file /var/mqm/qmgrs/<QMNAME>/qm.ini, and change the values:
LogPrimaryFiles=3 LogSecondaryFiles=2
To
LogPrimaryFiles=6 LogSecondaryFiles=6
I noted that there were 5 datasets in /var/mqm/log/<QMNAME>/active.
( with names S000000x.log, s = 0,1,2,3,4 ).
I restarted the qmgr, and ran for several days. There are now only 4 log datasets in var/mqm/log/<QMNAME>/active. I was expecting there to be 6. All 4 have been reused several times. I have circular logging.
What did I do wrong ? |
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| jefflowrey |
| Posted: Fri Jul 29, 2005 5:20 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Is it possible you simply didn't need 6 logs worth of space?
Did you receive any errors that indicated you ran out of space?
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I am *not* the model of the modern major general. |
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| pfarrel |
| Posted: Fri Jul 29, 2005 6:00 am Post subject: |
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Centurion
Joined: 16 Mar 2004
Posts: 120
Location: Kansas City
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It is certainly possible that I didn't need 6 logs. That is to say, my units of work are probably small enough that they don't span multiple logs.
My thinking was that since I already had 5 ( presumably 3 primary, and 2 secondary ), that I needed more primary, and that MQ would allocate more logs as it went along. I was not expecting MQ to delete a log ( bringing the number down from 5 to 4 ).
Doesn't this procedure that I used cause the queue manager to create additional logs, until the value of LogPrimaryFiles in qm.ini is reached ? |
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| jefflowrey |
| Posted: Fri Jul 29, 2005 6:04 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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It's entirely possible that at peak usage, you only used a little bit of the fifth log.
Secondary log files are deleted when they are not needed. So, likely, you went from using 3 primary and 1 secondary most of the time - with the second secondary used part of the time - to using only 4 primary most of the time.
Try putting a single, large, persistant message to a queue, and see what happens.
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I am *not* the model of the modern major general. |
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| PeterPotkay |
| Posted: Fri Jul 29, 2005 4:41 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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| jefflowrey wrote: |
| Try putting a single, large, persistant message to a queue, and see what happens. |
Under syncpoint. Otherwise, for circular logs, the persistent message never hits the log. And even with syncpoint, the persistent message will be removed from the circular log as soon as the UOW is commited.
_________________
Peter Potkay
Keep Calm and MQ On |
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