On Mar 14, 2009, at 10:23 PM, Larry Clark wrote:

What you say is curious..............only nodes that are in a
collocation
group should have data on the volumes in that collocation group. At
least
that is my understanding.

Your saying more than one collocation group can store data on the same
volume?

I know for collocation by node that would not be true............

Paul already mentioned the scenario in which TSM has to put a a
collocation group member's data on a tape that has data from another
group on it, due to resource constraints. You can get similar results
if a node's collocation group membership changes from one group to
another. In that case, data stays where it is, meaning the tapes now
contain data from two groups on them, even though TSM behaved exactly
as predicted.

I keep wondering if there's a way to mix groups' data on a volume
using MOVE DATA or MOVE NODEDATA, but since neither lets you specify a
target more exactly than a storage group, I haven't seen how yet.

Larry Clark

Nick