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| samgunddi |
 Posted: Fri Aug 01, 2008 9:37 am Post subject: MQ Cluster configuration |
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Acolyte
Joined: 17 May 2004
Posts: 54
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We have four queue managers in a cluster CLUS01. Queue managers GTW01 & BRK01 are full repository, CFG01 & GTW30 are partial repository.
WBRK01 has cluster sender channel, TO.GTW01 to GTW01 and cluster receiver channel TO.BRK01.
GTW01 has cluster sender channel, TO.BRK01 to BRK01 and cluster receiver channel TO.GTW01.
CMG01 has cluster sender channel, TO.BRK01 to BRK01 and cluster receiver channel TO.CMG01.
GTW30 has cluster sender channel, TO.BRK01 to BRK01 and cluster receiver channel TO.GTW30.
BRK01 and CFG01 are message broker & configuration manager queue managers and are hosted on a BRK server. GTW01 is hosted on BRK server.
GTW30 serves the need of SAP by an SAP WBI adapter and is hosted on its server. Cluster queues are hosted on BRK01, GTW01 and GTW30. So they have to exchange message back and forth.
SAP server has a different maintains cycle then BRK server. In the event of a scheduled GTW30 down-time, all messages from BRK01 to GTW30 will be stuck on SYSTEM.CLUSTER.TRANSMIT.QUEUE of BRK01.
How do we configure the MQ infrastructure so the message going to GTW01 from BRK01 are not affected?
Thanks in Advance.
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IBM Certified System Administrator
- WebSphere Message Queue V5.3
- WebSphere Message Broker v6.0
Last edited by samgunddi on Fri Aug 01, 2008 10:56 am; edited 1 time in total |
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| exerk |
| Posted: Fri Aug 01, 2008 9:54 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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The quick fix is to PUT disable the queue on GTW30, ensure all messages are consumed, then take down the queue manager (note: there must be at least one available queue instance available elsewhere in the cluster).
You might also want to look at...
| Quote: |
| GTW01 has cluster sender channel, TO.BRK01 to BRK01 and cluster receiver channel TO.BRK01. |
...but I am assuming this is a copy/paste error.
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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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| sami.stormrage |
| Posted: Fri Aug 01, 2008 11:00 am Post subject: |
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Disciple
Joined: 25 Jun 2008
Posts: 186
Location: Bangalore/Singapore
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And the Bind on Q's is set to NOTFIXED.
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Last edited by sami.stormrage on Fri Aug 01, 2008 11:08 am; edited 1 time in total |
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| samgunddi |
| Posted: Fri Aug 01, 2008 11:06 am Post subject: |
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Acolyte
Joined: 17 May 2004
Posts: 54
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exerk, good catch it  it was a copy/past error.
In case of SAP down (during maintenance) GTW30 will also be down. So i cannot disable the queue. Consider a scenario where message are generated by an app feeding to multiple targets.
One least available queue instance sounds interesting. I have the 2 concerns around it.
1. How/When should the message in this additional instance be routed to the destination queue.
2. Throughput might be reduced.
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- WebSphere Message Queue V5.3
- WebSphere Message Broker v6.0 |
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| sami.stormrage |
| Posted: Fri Aug 01, 2008 11:06 am Post subject: |
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Disciple
Joined: 25 Jun 2008
Posts: 186
Location: Bangalore/Singapore
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And the usual practise is to Suspend the Qmgr first and see that all the channel activity seizes before bringing down the Qmgr, so that Qmgrs the Cluster are aware that a particular Qmgr in the network is no longer available.
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| samgunddi |
| Posted: Fri Aug 01, 2008 11:10 am Post subject: |
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Acolyte
Joined: 17 May 2004
Posts: 54
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If I suspend the queue manage the app will still generate the message destined to the GTW30 cluster queue and land in DLQ.
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- WebSphere Message Queue V5.3
- WebSphere Message Broker v6.0 |
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| sami.stormrage |
| Posted: Fri Aug 01, 2008 11:13 am Post subject: |
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Disciple
Joined: 25 Jun 2008
Posts: 186
Location: Bangalore/Singapore
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How long has it been since u have restarted ur Broker Qmgr?
And when u say application feeding multiple destinations.. Do u mean to say that u have a Distribution list or Pub-Sub configured?
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| exerk |
| Posted: Fri Aug 01, 2008 1:35 pm Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| samgunddi wrote: |
exerk, good catch it it was a copy/past error.
In case of SAP down (during maintenance) GTW30 will also be down. So i cannot disable the queue. Consider a scenario where message are generated by an app feeding to multiple targets.
One least available queue instance sounds interesting. I have the 2 concerns around it.
1. How/When should the message in this additional instance be routed to the destination queue.
2. Throughput might be reduced. |
If there is only one instance of a queue within a cluster, therefore only one destination, any messages not transmitted before the queue/queue manager becomes unavailable will stack on the S.C.T.Q of the queue manager sending them. As a cluster is primarily aimed at load balancing, there is (generally) more than one instance of a queue within the cluster, hence my suggestion of put disabling the queue.
As far as I can see, if the SAP server is having maintenance applied, as there are no other instances of the queue in the cluster, whatever generates the messages will need to be shut down.
Is there scope to have two SAP servers, and load balance between them, and take them down one at a time for maintenance? (I've not encountered SAP and WMQ, so don't know if that is a stupid question, or not  )
I missed this the first time I posted...
| Quote: |
| How do we configure the MQ infrastructure so the message going to GTW01 from BRK01 are not affected? |
Did you mean GTW30?
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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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