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MQSeries.net Forum Index » Clustering » Disabling queues on a downed machine

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meaton78
PostPosted: Sun Jan 31, 2010 2:11 pm    Post subject: Disabling queues on a downed machine Reply with quote

Centurion

Joined: 16 Oct 2008
Posts: 100

Say there is are three servers that all host clustered queues a, b, and c and all take traffic equally. If server 3 has a hardware failure and goes away, is there a way of stopping other applications from trying to put to that queue? I'm assuming that the FR will still see the queues as enabled. Would the sending applications see that the channels are not running and try to send it to only the other two hosts?
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bruce2359
PostPosted: Sun Jan 31, 2010 2:31 pm    Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.

Quote:
I'm assuming that the FR will still see the queues as enabled.

Why would you assume that?

Quote:
Would the sending applications see that the channels are not running and try to send it to only the other two hosts?

Applications seldom, if ever, decide which instance of a clustered queue it sends messages to. This is left to the clustering software built into the qmgr.

If the sending application uses the MQI calls to inquire on channel status, then it is possible that an application could see that channels are not running. Having said that, re-read the sentence just before this one.
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exerk
PostPosted: Sun Jan 31, 2010 2:38 pm    Post subject: Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 6339

The clustering manual tells you what happens in this circumstance, and it will no doubt answer a lot of other questions you may have lurking...wonderful things manuals

Assuming that your applications are not specifying a queue manager name (affinities are bad practice) the clustering algorithm will take care of it.
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