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MQSeries.net Forum Index » Clustering » Cannot remove queuemanager from cluster

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Hedgehog12345
PostPosted: Fri Dec 12, 2008 2:16 am    Post subject: Cannot remove queuemanager from cluster Reply with quote

Newbie

Joined: 12 Dec 2008
Posts: 1

I am having problems removing a queuemanager from the cluster.

I have 2 FR and 2 PR (all in Unix). The 2 PR have to be removed from the cluster (these systems are going to be restaged)

On the PR1 I altered the clusterrcvr channel, making the cluster attribute empty. Then I did a refresh cluster on the FR. When I checked with dis clusqmgr it was indeed out of the cluster.

Now when I tried this with PR2, it didn't work. I did the exact same thing, but for some reason on FR1 it is indeed out of the cluster, but when I look at FR2 it isn't. The channels between the 2 FR are working.

I resorted to doing a 'reset cluster... qmid... action(forceremove)' but that didn't remove it.

Can anyone help me?

P.S. I already tried bringing it back into the cluster and trying it again, it didn't work
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exerk
PostPosted: Fri Dec 12, 2008 2:36 am    Post subject: Re: Cannot remove queuemanager from cluster Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 6339

Hedgehog12345 wrote:
On the PR1 I altered the clusterrcvr channel, making the cluster attribute empty. Then I did a refresh cluster on the FR...


Why?

Hedgehog12345 wrote:
I resorted to doing a 'reset cluster... qmid... action(forceremove)' but that didn't remove it.


Again, why?

Follow the Clustering manual, it will save you so much heartache.
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Vitor
PostPosted: Fri Dec 12, 2008 2:45 am    Post subject: Re: Cannot remove queuemanager from cluster Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA

Hedgehog12345 wrote:
On the PR1 I altered the clusterrcvr channel, making the cluster attribute empty. Then I did a refresh cluster on the FR.


Why a refresh? Why not the rest of the steps to remove a queue manager from a cluster?

Hedgehog12345 wrote:
When I checked with dis clusqmgr it was indeed out of the cluster.


No it wasn't .

Hedgehog12345 wrote:
Now when I tried this with PR2, it didn't work. I did the exact same thing, but for some reason on FR1 it is indeed out of the cluster, but when I look at FR2 it isn't. The channels between the 2 FR are working.


No, what you've got is an inconsistent and broken cluster.

Hedgehog12345 wrote:
I resorted to doing a 'reset cluster... qmid... action(forceremove)' but that didn't remove it.


No, it wouldn't

Hedgehog12345 wrote:
Can anyone help me?


Rebuild a new cluster with a new name and use that.

Hedgehog12345 wrote:
P.S. I already tried bringing it back into the cluster and trying it again, it didn't work


No, it wouldn't.
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zhanghz
PostPosted: Sun Dec 14, 2008 10:28 pm    Post subject: Reply with quote

Disciple

Joined: 17 Jun 2008
Posts: 186

how about trying refresh cluster on FR2? wait for a while, dis clusqmgr(*) on both FR1 and FR2 and see what happens..
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exerk
PostPosted: Sun Dec 14, 2008 11:44 pm    Post subject: Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 6339

zhanghz wrote:
how about trying refresh cluster on FR2? wait for a while, dis clusqmgr(*) on both FR1 and FR2 and see what happens..


How about following the Clustering manual? How about following Vitor's suggestion? How about considering that doing things "to see what happens" is one of the biggest causes of broken clusters?

There is a set of tried, tested, and trusted procedures for administering clusters, and the best advice and practice is to use them.
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys.
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zhanghz
PostPosted: Sun Dec 14, 2008 11:57 pm    Post subject: Reply with quote

Disciple

Joined: 17 Jun 2008
Posts: 186

hi, exerk, yes, we should have followed the manual, planned it thoroughly in advance. I suggested the above because the cluster seemed already in an inconsistent state, I guess one would want to make some desperate moves at this point, wishing that would work even though chances were slim.

I am not advocating changing without planning. It's not right in any case.
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Vitor
PostPosted: Mon Dec 15, 2008 12:36 am    Post subject: Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA

zhanghz wrote:
I guess one would want to make some desperate moves at this point, wishing that would work even though chances were slim.


If you're in a plane that's crashing, would you run to the front and grab the controls from the pilot, believing that it's best to make a desparate move and wish it would work? I have to admire the optimism, though I question the reasoning!

I think I see what you're getting at, but can't agree with it. Even if you're in desparate straits (and IMHO the original poster's certainly there) thrashing round wildly in the hope of fixing stuff is not going to help. Experience teaches that a bad situation can always get worse.

Or maybe that's just my experience.

There's also the management belief that, in a crisis, doing something is better than doing nothing and thinking counts as doing nothing. This is a trout-inducing school of thought.

zhanghz wrote:
I am not advocating changing without planning. It's not right in any case.


This is I think the key lesson from this post.
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PeterPotkay
PostPosted: Mon Dec 15, 2008 2:26 pm    Post subject: Reply with quote

Poobah

Joined: 15 May 2001
Posts: 7717

exerk wrote:
There is a set of tried, tested, and trusted procedures for administering clusters, and the best advice and practice is to use them.


And a bunch of problem scenarios in the back of the manual with detailed solutions for each. 99.9% of the time you can find one that matches your dilemma.
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Peter Potkay
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bruce2359
PostPosted: Mon Dec 15, 2008 3:03 pm    Post subject: Reply with quote

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Joined: 05 Jan 2008
Posts: 9442
Location: US: west coast, almost. Otherwise, enroute.

Ask any pilot, nothing beats a plan.
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