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MQSeries.net Forum IndexGeneral IBM MQ Supportmulti-instance QM: system invoked failover takes longer

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pcelari
PostPosted: Mon Jan 06, 2020 9:34 am Post subject: multi-instance QM: system invoked failover takes longer Reply with quote

Partisan

Joined: 31 Mar 2006
Posts: 378
Location: New York

Greetings.

In a multi-instance configuration, system failure triggered fail-over always takes much longer than manual fail-over triggered by endmqm -s.

The former typically takes minutes, while the latter just a couple of seconds.

Why is it so? If I turn off the power switch off the active instance server, or disconnect the network cable, wouldn't the locks be released right away and get held by the next poll from the standby instance?

thanks for sharing any insight.
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pcelari
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Andyh
PostPosted: Tue Jan 07, 2020 12:28 am Post subject: Reply with quote

Disciple

Joined: 29 Jul 2010
Posts: 179

A controlled failover will explicitly drop the file locks used by the active QMgr, while the abrupt termination of the server hosting the QMgr (or breaking the network links to the NFS server) will depend opon the NFS V4 lock leases expiring.
Adjusting the NFS lock lease time downwards is likely to improve matters.
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