Lawrence,
This is a good article on the subject.
https://www.ibm.com/developerworks/community/blogs/messaging/entry/websphere_mq_clusters_queue_manager_versions_and_release_migration?lang=en
".....communication between cluster queue managers works on a lowest common denominator basis. Administration messages include all information which the sender knows about, and if the recipient expected more, he fills in the blanks with defaults. Any excess information is discarded.
In theory then, any WMQ Queue manager will happily participate in a cluster with any other version from the day clusters were introduced (but of course, if a release is out of support you'd try it at your own risk). However, there are a few more things to think about.
If the Full Repository doesn't understand some fields of a structure, say a new property of a queue, or a whole new object type (for example Topic objects when they were introduced in Version 7), it won't be able to store and forward the new properties or objects. For this reason, we always recommend upgrading FRs first if at all possible. Don't worry if you can't do this for some reason - the cluster will still work fine, but you need to be careful not to make use of any new cluster function until you do get round to it. If you do try to make use of new features, bear in mind the above principle - WMQ will ignore what it doesn't understand, so things might look as though they're working... until you realise that that new workload balancing parameter isn't having the effect you wanted!"
Peter Potkay
From: MQSeries List [mailto:MQSERIES-0lvw86wZMd9k/bWDasg6f+***@public.gmane.org] On Behalf Of Coombs, Lawrence
Sent: Tuesday, December 17, 2013 7:47 PM
To: MQSERIES-0lvw86wZMd9k/bWDasg6f+***@public.gmane.org
Subject: Re: MQ Clustering question...
Thanks. I did this once, in a non-prod environment and something did not sit right with me because IBM always advise that you upgrade the FRs first.
From: MQSeries List [mailto:MQSERIES-0lvw86wZMd9k/bWDasg6f+***@public.gmane.org] On Behalf Of LM Demey (MQ)
Sent: Tuesday, December 17, 2013 3:20 PM
To: MQSERIES-0lvw86wZMd9k/bWDasg6f+***@public.gmane.org<mailto:MQSERIES-0lvw86wZMd9k/***@public.gmane.orgAC.AT>
Subject: Re: MQ Clustering question...
hello,
This is not recommended.
The FR store parameters for all MQ objects in the cluster.
A FR version 6 cannot store and disseminate specific parameters V7.5 and this can cause problems especially with the PROPCTL channels property.
(in fact this has been a problem with one of my customer with FR in version 6.0 and PR in version 7.0 and 7.1)
HTH.
Le 17/12/2013 19:22, Coombs, Lawrence a écrit :
Can you add a WMQ 7.5 queue manager to a cluster that has the full repositories still at WMQ 6.x? The better question would be should you?
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