Yes, you can collocate the copy pool and not the primary pool, no
problem.
Yes, it will decrease the number of tapes per node.
However, If you are sending the copy pool tapes offsite with a manual
pull/courier process, it will increase the number of tapes for your
courier run (which is why most sites don't collocate the copy pools).
In TSM 5.3, you can do collocation by a group of nodes. If you have
just a handfull of very important clients, for example, you could put
them all in the same collocation group, and just collocate those nodes.
As far as doing MVE NDEDATA, that's up to you.
When you turn collocation on, any newly written output is collocated.
Any old data stays where it is.
So as migration and reclamation occur, the data will gradually, over
time, all get collocated, even if you don't do MVE NDEDATA.
So the situation will gradually get better by itself, but not
necessarily quickly.
An appropriate strategy might be to do MVE NDEDATA for your most
critical clients, and leave the less important ones alone.
Message
From: ADSM: Dist Stor Manager [mailto:ADSM-L (AT) VM (DOT) MARIST.EDU] Behalf
Dennis Melburn W IT743
Sent: Tuesday, January 03, 2006 4:46 PM
To: ADSM-L (AT) VM (DOT) MARIST.EDU
Subject: Collocation Questions
I am doing server recovery exercises at all of our sites that have TSM
servers (TSM 5.3.2.0 on W2K3). Part of the recovery process is to
recall back tapes in our copy storage pools that belong to the node that
is being recovered. of the things I have noticed is that we are not
using collocation at our sites, and because of this, I am having to call
back a large amount of tapes for just one node. If I turn on
collocation on the copy storage pools, will this decrease the number of
tapes that are used per node? Do I have to do a move nodedata command
after turning collocation on for collocation to work? The reason why I
don't want to turn collocation on the primary storage pools is space (we
have a small library at most of the sites) and so I just want the copy
storage pools to be collocated. Will this work, without having the
primary storage pools collocated as well?
Mel Dennis