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| Multi-instance failover |
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| wmbwmq |
 Posted: Tue Oct 06, 2015 8:34 am Post subject: Multi-instance failover |
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Acolyte
Joined: 18 Jul 2011
Posts: 66
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Needed some help with the following...
Pass1
Let's say I started a MI QMGR with -x in both servers. QMGR in Server1 is active now. I kill critical MQ processes. Now QMGR is failed over to server2. Server1 QMGR status displays "running elsewhere"
Pass2
Now I got to server2 and kill critical processes. But the QMGR is not failing over to Server1.
Is this an expected behavior? Is there any way I can configure it to failover forever, whenever QMGR goes down (automatic scenario I am talking about) |
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| Vitor |
| Posted: Tue Oct 06, 2015 8:42 am Post subject: Re: Multi-instance failover |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| wmbwmq wrote: |
| Is this an expected behavior? |
Yes. See here:
| Quote: |
| Multi-instance queue managers are instances of the same queue manager configured on different servers. One instance of the queue manager is defined as the active instance and another instance is defined as the standby instance. If the active instance fails, the multi-instance queue manager restarts automatically on the standby server |
Server 2 (in your example) is the standby of Server 1. It's not bi-directional.
| wmbwmq wrote: |
| Is there any way I can configure it to failover forever, whenever QMGR goes down (automatic scenario I am talking about) |
You can't do that with a lot of dedicated HA software.
Because most people don't want some external failure to cause the software to fail backwards and forwards endlessly between two servers trying to start. You also don't want the standby instance unilaterally deciding it's going to fail back to the active instance "because it seems to be working now".
If you always want to have at least one queue manager available you need to combine HA with another technology, such as clustering, to provide that kind of availability.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| wmbwmq |
| Posted: Tue Oct 06, 2015 1:05 pm Post subject: |
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Acolyte
Joined: 18 Jul 2011
Posts: 66
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| samsansam |
| Posted: Thu Oct 08, 2015 7:47 pm Post subject: |
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Apprentice
Joined: 19 Mar 2014
Posts: 41
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| if Server 1 showing "running elsewhere" means the QMGR on Server 1 is down and QMGR is active on Server 2. For failover Server 1 must show "Standby" . In my case , I created cronjob to check the status of QMGR , if it is not running or standby , issue strmqm -x xxxxx |
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