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| conditions for multi-instance qmgr switch over |
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| sangminli |
 Posted: Thu Jul 21, 2011 7:54 am Post subject: conditions for multi-instance qmgr switch over |
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Voyager
Joined: 26 Aug 2008
Posts: 75
Location: Hangzhou, China
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Hi all, I have some doubts regarding the conditions that would trigger the switch of the active qmgr instance to the standby one. In the info center, the conditions are described as below:
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The active instance might fail for various reasons that result in the standby taking over:
#1 Failure of the server hosting the active queue manager instance.
#2 Failure of connectivity between the server hosting the active queue manager instance and the file system.
#3 Unresponsiveness of queue manager processes, detected by WebSphere MQ, which then shuts down the queue manager.
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below is my understanding:
#1 the server hosting the qmgr is down (power cut-off, any other situation?)
#2 the server hosting the active queue manager lost the network connectivity to the networked file system
#3 which qmgr processes would cause the qmgr down? which process would shutdown the qmgr(one monitoring process? i suppose)? |
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| Vitor |
| Posted: Thu Jul 21, 2011 8:03 am Post subject: Re: conditions for multi-instance qmgr switch over |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| sangminli wrote: |
| In the info center, the conditions are described as below: |
It might have been nice if you're posted a link to where it says this (for the record it's here).
| sangminli wrote: |
| #1 the server hosting the qmgr is down (power cut-off, any other situation?) |
How about deliberately or inadvertently closed by the admin?
| sangminli wrote: |
| #2 the server hosting the active queue manager lost the network connectivity to the networked file system |
That covers a multitude of sins.
| sangminli wrote: |
| #3 which qmgr processes would cause the qmgr down? which process would shutdown the qmgr(one monitoring process? i suppose)? |
Any of the ones in the admin guide theoretically.
But you don't actually say what your doubts are? When the failover would occur? What would cause it?
Or if there's a chance that a problem won't be detected and failover won't happen automatically? Of course there's a chance. There's a chance with Vertias, HACMP and any other HA software.
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Honesty is the best policy.
Insanity is the best defence. |
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