MC ServiceGuard 11.19

[Tom Haddad]

I have a 2 node cluster right now witn quorum server offine. Whether i HALT either node or package, cluster will not fail will it?

[Mel Burslan · Accepted solution]

provided your tie-breaker (let it be a lock disk or a quorum server) is configured and working properly, single node can hold the cluster up if the other one fails for a reason or gets deliberately shutdown. As a matter of fact it is one of the advantages of having a cluster, as in, you do maintenance on the inactive node and reboot if necessary, while the application runs on the other node.

Having said that, when was the last time you performed a failover test ? Was there anything major happening to your data center, like a storage array change, networking reconfiguration etc (major event) ?

Make sure to check the cluster/package log and syslog for any recent cluster related messages before committing such an act.

Normally, nothing should go wrong, but living in the trenches for the past 15+ years, I know that there is nothing normal about any data center.

[Tom Haddad]

Thanks..at this time I have one package per node. I plan to only halt one of the packages at this time (I made some package changes..testing the starup). Nodes will remain up!

[Mel Burslan]

If your desire is just to keep the halted package down (not starting up on the other node), cmhaltpkg command should be all you need and you should be good

If your desire is to keep the package from coming up on the secondary node, when its primary node shuts down for any reason, then you need to modify the package failover policy in the package control file and distribute it to both nodes, before doing such thing.

When you are testing the automatic fail over process, in case of one of the nodes disappears, the warnings and checks I mentioned on my first response are still valid.

[Tom Haddad]

Thanks..great advice.

[Tom Haddad]

Thanks for the info!

[P Arumugavel]

If you halt the node, the running package will fail over if it should be.
If you do cnhaltpkg, package halts in current running node. It disables package switching.
Cluster will not fail.

Rgds...