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How many full repositories should you have in a WebSphere MQ cluster? The Queue Manager Clusters manual says “preferably two” and “Having only two full repositories is sufficient for all but very exceptional circumstances” (see doc).

The reason for having two rather one is for availability reasons (one is a single point of failure). Single point of failure is probably somewhat of an overstatement, as the impact of all full repositories being unavailable is that definitional changes (e.g. define/alter cluster queues or cluster queue receiver channels) cannot be shared with the cluster.

Application messages between available cluster queue managers can still flow when full repositories are not available, so the impact is to cluster object changes rather directly on application traffic.

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Emir Gaza (Consulting IT Specialist, Hursley Software Lab Services) and I are currently putting together a list of SSL gotchas based on our personal experiences and, of course, those of our customers. Our list covers many problems and solutions already well documented in the manuals (e.g. Error messages), but what we’re trying to do is compile a single list containing both common problems and those with sometimes cryptic solutions.

We aim to expand this list in future with more items and more detail, but for now, here’s the list we have compiled… Comments most welcome…

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Assuming your phone has a browser, it is now possible to utilise the HTTP support in supportpac MO71 to view your WebSphere MQ queues, messages and more. The following blog entry gives an overview of MO71 HTTP support and simple instructions on accessing it from a web browser.

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