This will depend on the size of your mainframe, we run on OS/390, we have 6 
systems running 9 LPARS, plus some extra LPARS for other workload.  We have 15 
instances of TSM running on various systems and run up to 8 of these on one 
LPAR at any time.  If you want the exact size of our systems and LPARS, I would 
have to track those numbers down.  I do know that TSM as a whole utilizes very 
little of our mainframe and has never had a problem keeping up and we backup 2 
TB from over 800 clients nightly.  The short of it is, if your mainframe has 
enough CPU power you will be OK.

Ryan Miller
 
Principal Financial Group
 
Tivoli Certified Consultant
Tivoli Storage Manager v4.1


-----Original Message-----
From: Thomas Denier [mailto:Thomas.Denier AT MAIL.TJU DOT EDU]
Sent: Friday, February 07, 2003 2:45 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Future of mainframe TSM


We run a 4.2.3.2 TSM server under OS/390. We have about 110 active client
systems, sending about 300,000 files and about 70 gigabytes to the server
each night. Our best estimate is that this workload will double in the
next two years. Is it reasonable to stay with an OS/390 or zOS server in
the face of the projected growth? If so, how do we prove that the
mainframe is up to the task? Most IT managers around here want to
believe that the mainframe is the wrong choice for TSM or anything else.