08-13-2013
I do not have an "HACMP" (v1-v5) (aka PowerHA (v6) aka System Mirror (v7)) handy, but since HACMP v5 volume groups are meant to be "enhanced concurrent".
What this means in "AIX speak" is that the VGDA is open on both sides so that when the active side makes a change to the volume group that inactive (passive) side can update the ODM with the data - which speeds up the takeover time when either moving a resource group manually of during a failover. The reason being - getting the VGDA (read ODM) data current during a move was often 30-50% of the time needed for a move. "Enhanced" concurrent speeds this up.
You should be able to synchronize the resource groups. You may get an warning about not being "enhanced concurrent" - but this means your move/failover will take longer.
To make it enhanced concurrent you will need to stop the application so the volume group can be varied off and then on again.
p.s. when a disk is part of an enhanced concurrent vg it can be used for a non-IP network for passing a heartbeat. This is changed, I do not know the details, in SystemMirror (v7) as it uses CAA (Cluster Aware AIX) rather than RSCT for topology monitoring.
Hope this clarifies it enough for you, and the AIX speak was not too difficult :wink:
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