11-25-2015
I have not much with PowerHA/SystemMirror - very first versions such as 7.1.0 to 7.1.1 and later - HOWEVER - I do recall there is a fundamental change in the way CAA (cluster aware AIX) is implemented that made it impossible to update 7.1.0 to 7.1.1, The only path was remove, and start again. I have heard that has been softened a bit - but I prefer clean and tend to not use migration/upgrade paths in general.
A basic feature in PowerHA has been the ability to stop the cluster while leaving the application running. Will this (leaving applications "unmanaged by PowerHA", but operational minimize your downtime sufficiently?
PowerHA/SystemMirror from 7.1.0 to 7.1.3 - what else are you updating? Won't those updates require some maint. time as well? Why not combine them? imho it is not fair to put a requirement for downtime for maint solely on the OS and/or middleware. Applications need maint. as well. The 'business' should know/understand that - and sign off for the impact of unexpected downtime that could have been prevented if maint had been timely. (Or do you wait for your engine to lock up before going to the garage for an oil change?).
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