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MQSeries.net Forum IndexGeneral IBM MQ SupportRecovery and Restart by using Circular or Linear Logging

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venkat kurra
PostPosted: Wed Oct 24, 2001 8:47 am Post subject: Reply with quote

Master

Joined: 18 Oct 2001
Posts: 245
Location: Bloomington , IL

Hi,
In our comapany we are getting thousends of messages with each message having 10 to 100mb size.So which Log is better and how many primary and secondary files with how much size?I don't want default queue manager..is it OK.
Thanks,
Venkat Kurra
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bduncan
PostPosted: Wed Oct 24, 2001 10:06 am Post subject: Reply with quote

Padawan

Joined: 11 Apr 2001
Posts: 1554
Location: Silicon Valley

I think an important question before we can make an estimate of log type/size would be whether or not you are using syncpoint. If you are doing this, all outstanding units of work are written to your logs, increasing the amount required very quickly. Furthermore, are you dealing with persistent or non-persistent messages?


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venkat kurra
PostPosted: Wed Oct 24, 2001 10:17 am Post subject: Reply with quote

Master

Joined: 18 Oct 2001
Posts: 245
Location: Bloomington , IL

Quote:

On 2001-10-24 11:06, bduncan wrote:
I think an important question before we can make an estimate of log type/size would be whether or not you are using syncpoint. If you are doing this, all outstanding units of work are written to your logs, increasing the amount required very quickly. Furthermore, are you dealing with persistent or non-persistent messages?



Thanque for your immidiate replay.we are using persistent messages but no syncpoint.Please let me know if we use syncpoint(each 4mb) how many primary and secondary files with how much size?
Thanks,
Venkat

[ This Message was edited by: venkat kurra on 2001-10-24 11:20 ]
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bduncan
PostPosted: Wed Oct 24, 2001 3:20 pm Post subject: Reply with quote

Padawan

Joined: 11 Apr 2001
Posts: 1554
Location: Silicon Valley

Well, the IBM answer would be to look at the System Administration Guide under Chapter 14, "Recovery and Restart" there is a section for calculating the size of your logs. Here is a link:
http://publibfp.boulder.ibm.com/epubs/html/amqzag02/amqzag02tfrm.htm
However, my experience has shown that following these sizings are typically far to smaller especially when you have large numbers of messages residing on queues at any one time (I always thought the depth of committed messages on the queue played no factor in the log usage but apparently during periods of high throughput the amount of log space utilized by checkpointing increases).
The best way to size the logs is to start with something close to what the MQSeries System Administration Guide recommends. Once you have this figure, for an example let's say it's 50Mb, make sure to place most of this in the form of secondaries. In other words, if your log size is specified as 1024 (so 4Mb per log), set 2 primaries (8Mb) and 11 secondaries (44Mb). This way, you can watch the /var/mqm/log/qmgrname/active directory and see how many secondaries get created over time. If you come close to using all the secondaries, then you should increase them even further...


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