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Esa
PostPosted: Wed Nov 09, 2016 2:23 am    Post subject: Very slow multi-instance broker Reply with quote

Grand Master

Joined: 22 May 2008
Posts: 1387
Location: Finland

I have a new multi-instance broker that is very slow with deployments and mqsi commands. I think there must be something wrong with configuration. NFS4 should not make the broker that slow, I think.

In fact the broker crashes when I try to deploy a bar file. The abend file does not get created under the shared workpath but in /var/mqsi/common/errors.

Version 9.0.0.5.

mqsireportbroker shows

Work path = /var/mqsi

Shared Work Path = /mqsi/SOMEBROKER/mqsi

Work path is set by mqsiprofile script in product installation directory.

I'm just wondering if having both Work path and shared work path configured might cause slowness and crashing?
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fjb_saper
PostPosted: Wed Nov 09, 2016 5:37 am    Post subject: Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20696
Location: LI,NY

Thanks for specifying the version (9.0.0.5)...

As to the slowness it should not be a result of going multi-instance.
I would ask if you are deploying a SOAP node with a lot of unimplemented operations, or just a lot of operations... but then you are stating that all mqsi commands are slow...

Best bet is to take a service trace and submit it to IBM in a PMR.

Have fun
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Craig B
PostPosted: Thu Nov 10, 2016 3:33 am    Post subject: Reply with quote

Partisan

Joined: 18 Jun 2003
Posts: 316
Location: UK

Do you know if your BAR file deploys to a none HA broker ok? Or is this the first time you have deployed this BAR file and it just happened to be a HA broker?
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Craig
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Esa
PostPosted: Mon Nov 14, 2016 1:45 am    Post subject: Reply with quote

Grand Master

Joined: 22 May 2008
Posts: 1387
Location: Finland

I investigated the problem a little closer and found out that on both systems /var/mqm is a link to the shared nfs4 disk. That makes for example mqs.ini shared between the two queue manager instances. As far as I understand that makes the two instances the *same* instance and could be the root cause of the latency.

What do you think, should I tear down and rebuild everything? I think I can reconstruct a somewhat intact /var/mqm on both servers so that I don't need to reinstall the software.
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fjb_saper
PostPosted: Mon Nov 14, 2016 5:22 am    Post subject: Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20696
Location: LI,NY

Esa wrote:
I investigated the problem a little closer and found out that on both systems /var/mqm is a link to the shared nfs4 disk. That makes for example mqs.ini shared between the two queue manager instances. As far as I understand that makes the two instances the *same* instance and could be the root cause of the latency.

What do you think, should I tear down and rebuild everything? I think I can reconstruct a somewhat intact /var/mqm on both servers so that I don't need to reinstall the software.


Try and let us know the result. How about /var/mqsi ? is that shared as well?
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Esa
PostPosted: Mon Nov 21, 2016 12:01 pm    Post subject: Reply with quote

Grand Master

Joined: 22 May 2008
Posts: 1387
Location: Finland

No, it did not help. And yes, /var/mqsi was shared as well, but not any more. There were some other things that I needed to fix as well but deployments remain very slow. It must be some misconfiguration of NFS4 that causes the latency. I know that our NetApp is not at the latest level, for example.
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mqjeff
PostPosted: Mon Nov 21, 2016 12:14 pm    Post subject: Reply with quote

Grand Master

Joined: 25 Jun 2008
Posts: 17447

The shared disk has to be attached to both systems at all times.
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Esa
PostPosted: Wed Nov 23, 2016 9:45 am    Post subject: Reply with quote

Grand Master

Joined: 22 May 2008
Posts: 1387
Location: Finland

The shared NFS4 disk was mounted with a bad options.
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