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Broker HA Configuration

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Posted: Thu Mar 29, 2012 3:12 am Post subject: Broker HA Configuration

Centurion

Joined: 23 Jun 2003
Posts: 139

Hi,

What are the advantages/disadvantages of configuring message broker as a HA Service group as described in :

http://publib.boulder.ibm.com/infocenter/wmbhelp/v7r0m0/index.jsp?topic=%2Fcom.ibm.etools.mft.doc%2Fbe13730_.htm

as against configuring it to start up as an MQ service (which would of course mean it would be tightly couple with MQ) as descrined in :

http://publib.boulder.ibm.com/infocenter/wmbhelp/v7r0m0/index.jsp?topic=%2Fcom.ibm.etools.mft.doc%2Fbe13790_.htm

any thoughts?

Cheers

lancelotlinc

Posted: Thu Mar 29, 2012 5:09 am Post subject:

Jedi Knight

Joined: 22 Mar 2010
Posts: 4941
Location: Bloomington, IL USA

The documentation is incorrect. There are pending requests to get the doc updated.

When you use MQ service Id to start a Broker, the primary group membership is mqm not mqbrkrs. This creates a permissions problem with a semaphore used by WebSphere Message Broker. A semaphore is created when the first broker starts after a reboot (or after an initial installation), and only members of the semaphore creator's primary group can access this semaphore. This problem is a consequence of the UNIX System V IPC primitives that are used by WebSphere Message Broker.

Any broker that is started by a user who'se primary group is not the semaphore creator's primary group ( ie. mqbrkrs ) causes the Broker to hang on subsequent mqsi commands.

That being said, HA failover may be acceptable to some. If you really want to dig into the issue, we should talk about the goals you have for high availability. Active-active provides more higher availability at less cost than active-passive in most goal-oriented analysis.
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Posted: Thu Mar 29, 2012 8:33 am Post subject:

Centurion

Joined: 23 Jun 2003
Posts: 139

thanks for the update, Sir Lancelot.

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