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Operating Systems AIX [Howto] Update AIX in HACMP cluster-nodes Post 302778959 by bakunin on Monday 11th of March 2013 08:58:46 PM
Old 03-11-2013
Quote:
Originally Posted by DGPickett
So, is the HACMP as a whole never down, just degraded to fewer nodes?
Yes. Exactly this is the point.

Quote:
Originally Posted by DGPickett
It seems like with a HA cluster, you can update hosts in rotation and return them to the pool, so it is only down on host at a time.
Yes and no. The point is that the HA-communication is done via RSCT and the versions of the RSCT packages have to be consistent throughout the cluster at any time. This is why you have to split up the cluster into single nodes at one point (precisely the point where you update the RSCT). During this phase communication would not be possible. But as each node is single at this time it doesn't recognize this inability to communicate.

I hope this helps.

bakunin
 

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