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MQSeries.net Forum Index » Clustering » Drawbacks of MQ Clustering?

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Kjell
PostPosted: Mon Oct 28, 2002 8:31 am    Post subject: Drawbacks of MQ Clustering? Reply with quote

Acolyte

Joined: 26 Feb 2002
Posts: 73

Hi this is a general one,

Clustering seems to be a very good thing, it has a lot of advantages. However since everything has cons and pros that must go for Clusters as well.

I am curious to hear abou the downside of clusters. Which pitfalls have you found? Which are the risks? In which situation is a Cluster less suitable?

All experiences in this area are welcomed.

Rgds K
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2189
PostPosted: Wed Oct 30, 2002 3:00 am    Post subject: Reply with quote

Apprentice

Joined: 22 Oct 2002
Posts: 31

We use clustering throughout our production environment. This at the moment isn't very big as we only have 20 Qmgrs and we've experienced so many problem it's untrue.

My experience is that the concept of clustering is excellent however implementing it on versions of MQ up to 5.2 and 5.2.1 CSD03 is somewhat flaky. The fact IBM have improved the management of clusters in v 5.3 shows that clustering problems are inevitable. I don't understand how the cogs all wirr in clustering but it's a shame they can't improve the reliability of clustering rather that just improve the tools to fix the problems.

All the major problems we've had all revolve around a qmgr not being able to see a clustered object with no propagation of changes to clustered objects second on our fault hit list.

I don't think we've had one clustered environment where we haven't encountered a 2189 error (MQRC_CLUSTER_RESOLUTION_ERROR) at some stage (hence my nickname). I've pretty much got to grips with fixing them now in most cases.

This probably sounds like I'm slagging off clustering and I don't mean to. It's got it's probelms but I'd stick with it as I now have experience of most of the problems, plus the potential of reduced overhead in creating channels and remote queues in a large configuration is enormous.

One final thing though, we have had to introduce a non-clustered solution in production due to our clustering problems (unfortunately for us the projects using MQ have put a change freeze on MQ so we can't upgrade to 5.3.). So I'd recommend it's worth having non-clustered scripts ready as a backup plan on critical systems in case of a major clustering failure.
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