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sumeet · Posted: Tue Jun 01, 2004 11:33 am Post subject:

Hello all,

I am a beginner to clusters and had some questions on clustering.

To give a background, we have multiple servers who need to communicate with each other. One option was to have multiple point to point connections (with multiple objects to create / administer), another was to use clusters (ease of administration).

1) Is it necessary that all queue managers that are part of a cluster, be always online (24x7)? I assume that should not be the same but wanted to be sure about it.

2) Assuming that queue managers can go offline from a cluster, what does one need to do if before a queue manager goes offline / comes back online?

3) If I understand correctly, instead of a multiple transmission queues (one for each destination) cluster queue managers have a common transmission queue. In case a queue manager within the cluster (QM1) is down and another queue manager (QM2) has to send messages to it, the message will be stored in the transmission queue of QM2. Since QM1 is down for some time, the messages would get piled up at XMITQ of QM2. My question is that if QM2 now starts sending out messages for QM3 (which is available online) will they have to wait till the messages for QM2 are cleared out from the transmission queue (FIFO rule?).

Any help would be appreciated.

Thanks,
Sumeet
Please note that I am looking at queue manager clusters only from ease of administration (less number of objects to create / administer) and not as a load balancing / failover option.