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MQ and CFDT

 
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rakesh_mishra18

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Joined: 15 May 2006
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Location: Jamshedpur

PostPosted: Wed Jan 28, 2009 7:33 am    Post subject: MQ and CFDT
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Hi,

For large volume which is better, CFDT or MQ on a sysplex environment. Can we configure MQ in a way that messages are written in memory instead of disk. This is just to make the performance better.
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dbzTHEdinosauer

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Joined: 20 Oct 2006
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Location: porcelain throne

PostPosted: Wed Jan 28, 2009 2:53 pm    Post subject:
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Quote:
This is just to make the performance better.


at the expense of security, rollback, recovery....

I think you will find that if you chose MQS,
you will find that your performance will not suffer due to queue disk writes.
I would look more towards tuning your application.

no experience with CFDT.
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enrico-sorichetti

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Location: italy

PostPosted: Wed Jan 28, 2009 3:04 pm    Post subject: Reply to: MQ and CFDT
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a general performance remark,
in a "integrity sensitive" application the work for an I/O operation can be split as ( very rough approximation )

20% houskeeping
20% the I/O itself
60% recovery restart related tasks

the I/O part can be split
18% buffer management
2% real I/O ( posibly less )

using real storage instead of dasd You still have
18% buffer/storage management

with the current I/O technologies mostly cache related
the 2% part of the I/O might even happen much later, even hours

so the concern of using storage instead of dasd is becoming less and less important
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rakesh_mishra18

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PostPosted: Thu Jan 29, 2009 1:27 am    Post subject: Reply to: MQ and CFDT
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Thanks for the reply..earlier we proposed CFDT but later see on IBM site that for large volume of message CFDT is not recommended. Now we are proposing MQ but once client came to know that MQ writes the messages on disk they are bit worried as CFDT write the messages to memory.
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dbzTHEdinosauer

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PostPosted: Thu Jan 29, 2009 1:58 pm    Post subject:
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sometimes, you need to educate clients.
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Garry Carroll

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Joined: 08 May 2006
Posts: 995
Location: Dublin, Ireland / Edinburgh, Scotland

PostPosted: Thu Jan 29, 2009 2:53 pm    Post subject:
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Quote:
once client came to know that MQ writes the messages on disk they are bit worried


AFAIK, if you opt to use non-persistent messages, MQ will not harden the messages to disk. This is, as Dick says,
Quote:
at the expense of security, rollback, recovery....


Garry.
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