I did that about 2 years ago.  Not quit as big as you at the time...
I did not move everybody at once.  Moved AIX nodes then my Novell then my
NT/2000 then Oracle & MS SQL nodes because that is the way I broke out my
storage pools.
Depending on what version of TSM you are on should be easier (if you are
high enough to have move nodedata command).
It was no fun because the tapes that had more then 1 node on it I had to
move it to a temporary disk pool then the final tape pool.
One thing you will gain is all your new tapes will be nice & compacted!
Hope this helps!


--------------------------------------
Bruce Kamp
Midrange Systems Analyst II
Memorial Healthcare System
E: bkamp AT mhs DOT net
P: (954) 987-2020 x4597
F: (954) 985-1404
---------------------------------------


-----Original Message-----
From: William Rosette [mailto:Bill_Rosette AT PAPAJOHNS DOT COM]
Sent: Tuesday, July 29, 2003 11:23 AM
To: ADSM-L AT VM.MARIST DOT EDU

Hi TSM'ers

      Has anybody out there gone from 3 years of nocollocation and then
changed to collocation for better restores.  We are currently at 2-3+ TB of
info on 540 tapes (this is all in our 1 TAPEPOOL).  We have about 410
scratch tapes and the uppers are worried about making the global switch to
collocate will cause TSM to crash due to no scratch tapes.  Also if there
are any other gotcha's I would be greatly appreciated.  Maybe even send
you, some of our greatest pizza haha.

Thank You,
Bill Rosette
Data Center/IS/Papa Johns International
WWJD