[gpfsug-discuss] reduce cnfs failover time to a few seconds

Sabuj Pattanayek sabujp at gmail.com
Tue Aug 12 23:16:22 BST 2014

Hi all,

Is there anyway to reduce CNFS failover time to just a few seconds?
Currently it seems like it's taking 5 - 10 minutes. We're using virtual
ip's, i.e. interface bond1.1550:0 has one of the cnfs vips, so it should
be fast, but it takes a long time and sometimes causes processes to
crash due to NFS timeouts (some have 600 second soft mount timeouts).
We've also noticed that it sometimes takes even longer unless the cnfs
system on which we're calling mmshutdown is completely shutdown and
isn't returning pings. Even 1 min seems too long.

For comparison, I'm running ctdb + samba on the other NSDs and it's
able to failover in a few seconds after mmshutdown completes.

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