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MQSeries.net Forum IndexClusteringRemoving full repository and cluster channels from cluster

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ZK99TOE
PostPosted: Thu Nov 16, 2017 5:26 pm Post subject: Removing full repository and cluster channels from cluster Reply with quote

Newbie

Joined: 04 Sep 2013
Posts: 7

I'm following "Task 9: Removing a cluster network"
http://publibfp.boulder.ibm.com/epubs/html/csqzah06/csqzah06tfrm.htm

I have two queue managers, QM1 & QM2, that are currently full repositories for cluster TEST. I am removing the TEST cluster from QM1 & QM2.

QM1 & QM2 are also full repositories for a new and improved cluster, which is why TEST is being removed.

I'm trying to understand why both QM1 CLUSSDR and CLUSRCVR get removed before CLUSSDR and CLUSRCVR are removed from QM2.

I would have thought I should remove CLUSSDR from both QM1 & QM2 and then both CLUSRVCRs.

Is it because I will already have spaced out the REPOS attribute on both queue managers, so as partial repositories QM1 & QM2 won't be supplying information to each other?

thanks...
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PeterPotkay
PostPosted: Thu Nov 16, 2017 6:39 pm Post subject: Reply with quote

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Joined: 15 May 2001
Posts: 7380

That link you posted is from 15 years ago, for a version of MQ that has been out of support for many, many years.

Here is a link to the steps for MQ 7.5, the oldest version of MQ currently supported:
https://www.ibm.com/support/knowledgecenter/SSFKSJ_7.5.0/com.ibm.mq.con.doc/q017500_.htm


Consider a cluster with 1000 QMs. If you were breaking this cluster down, you would remove one QM at a time, removing the cluster channels in the order and manner described. One QM at a time. When you had only 2 QMs left in the cluster, you would still perform the cluster channel steps on only one QM at a time.
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ZK99TOE
PostPosted: Mon Dec 04, 2017 10:54 pm Post subject: Reply with quote

Newbie

Joined: 04 Sep 2013
Posts: 7

Thanks for the updated link.
Im trying to understand the difference between what happens to the two queue managers when removed as full repositories, vs. removing a queue manager from a cluster (which I have done many times).
The cluster is being deleted, so there wont be a full respository after Im done.

For removing the queue manager from a full repository, after removing the REPOS value from the queue manager, I remove the CLUSTER value of a CLUSSDR first rather than the CLUSRCVR.
1) Why the CLUSSDR from the cluster first does the QM2 CLUSRCVR create a CLUSSDRA on QM1?
2) How do the cluster channels on QM2 respond when when both QM1's CLUSSDR and CLUSRCVR removed from the cluster?
3) Does the QM2 CLUSRCVR still communicate QM1 with based on QM2s locally held cached information?
4) What is critical about the order in which the channels are removed from the cluster?
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bruce2359
PostPosted: Tue Dec 05, 2017 4:58 am Post subject: Reply with quote

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Joined: 05 Jan 2008
Posts: 7858
Location: US: west coast, almost. Otherwise, enroute.

ZK99TOE wrote:

4) What is critical about the order in which the channels are removed from the cluster?

What is critical is that the order of events is documented and fully supported by IBM, and it works.
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