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| Nigelg |
 Posted: Tue Dec 19, 2006 12:15 am Post subject: |
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Grand Master
Joined: 02 Aug 2004
Posts: 1046
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I would advise that you get on the latest maintenance. I know that there have been some APARs which affect performance in a large cluster.
DO NOT issue REFRESH CLUSTER without serious thought. Discarding all cluster information and collecting it again from all qmgrs in the cluster could take some time and involve many channels starting and passing thousands of messages. It is hardly EVER necessary to refresh the cluster.
The same applies to RESET CLUSTER.
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| HubertKleinmanns |
| Posted: Tue Dec 19, 2006 2:25 am Post subject: |
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Shaman
Joined: 24 Feb 2004
Posts: 732
Location: Germany
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The size of a cluster is limited by the number of channels a server can support. At the European WebSphere Technical Conference 2005 in Germany, Ian Vanstone gave some values for z/OS:
| Quote: |
- 9000 number of channels.
- 4500 number of QMgrs (each with one cluster sender and one cluster receiver channel).
- More QMgrs can be achieved by writing cluster workload exists. |
But I agree, the bottleneck will be the SYSTEM.CLUSTER.TRANSMIT.QUEUE.
Instead of using 4500 QMgrs in one single cluster, I would prefer, to create 5 or 10 smaller, overlapping clusters with a number of gateways. I agree also, that it does not make sense, to have hundreds of clusters, but if you are able, to divide your environment into pieces, which are more or less independent, but sometimes messages have to be from one environment into another, such a method makes sense. There is also no need, that the pieces have the same size. It is more a question of logical or functional ordering.
650 QMgrs in one cluster is big (I found in IBM docs, that "more than 4 QMgrs" is big  ), but no real problem.
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Hubert |
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