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rakesh_mishra18
New User
Joined: 15 May 2006 Posts: 23 Location: Jamshedpur
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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
Global Moderator
Joined: 20 Oct 2006 Posts: 6966 Location: porcelain throne
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This is just to make the performance better.
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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
Superior Member
Joined: 14 Mar 2007 Posts: 10872 Location: italy
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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
New User
Joined: 15 May 2006 Posts: 23 Location: Jamshedpur
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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
Global Moderator
Joined: 20 Oct 2006 Posts: 6966 Location: porcelain throne
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sometimes, you need to educate clients. |
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Garry Carroll
Senior Member
Joined: 08 May 2006 Posts: 1193 Location: Dublin, Ireland
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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,
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at the expense of security, rollback, recovery.... |
Garry. |
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