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MQSeries.net Forum Index » Clustering » Cluster Load Balancing

Cluster Load Balancing

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MQS

Posted: Fri Mar 08, 2002 3:03 pm Post subject:

Newbie

Joined: 12 Feb 2002
Posts: 7

I need some help on cluster load balancing
Let me first explain how i have setup my cluster.

Two Servers Server1 and Server2
Four Queue Managers - QM1 & QM3 on Server1 and QM2 & QM4 on Server2
Created a cluster first with QM3 & QM4 and both hold full repositories.
Then added QM1 to the cluster from Server1 and QM2 to the cluster from Server2.
Created Identical Queues in both QM1 & QM2.
Copied the client connection table of QM3 which has connection of QM4 to my local client machine.
Now if i try to put messages to the cluster. MQ puts messages only to the queues in QM1, it does not do a round robbin and put messages to the queues in both QM1 & QM2.

I am not sure where i am going wrong , please help.

Thanks

NickB

Posted: Mon Mar 11, 2002 1:20 am Post subject:

Centurion

Joined: 20 May 2001
Posts: 107
Location: Zurich Financial Services

It is possible that the initial qmgr is always able to service the requests and so the round-robin algorithm does not need to kick in. The algorithm does not put one message to each qmgr in turn within the cluster, it continues to send to a qmgr whilst it is able to process the messages effectively. You will start to see sharing under higher volumes or if the initial qmgr goes offline for example.

mrlinux

Posted: Mon Mar 11, 2002 4:08 am Post subject:

Grand Master

Joined: 14 Feb 2002
Posts: 1261
Location: Detroit,MI USA

Well does your application close the queue and reopen it ?? Becuase once it has a successful connection it will not switch Queue Managers. Also
Iam not certain but I dont think you can get client applications to use the cluster worload balancing , becuase you etiher have to use the MQSERVER env variabel or if you use the channel table and it has the queue manager name in the channel definitions.

_________________
Jeff

IBM Certified Developer MQSeries
IBM Certified Specialist MQSeries
IBM Certified Solutions Expert MQSeries

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