Ed,

You are right on both counts;  backup objects have one set of retention 
parameters, from the MC in the backup copygroup;  backupset is one way to 
achieve different retention (for all the active objects at the point-in-time 
it's created); another method is to use more than one nodename, and/or play 
with export/import -- not really the intended backup/restore scenario TSM was 
designed to handle.... the only way to achieve different retention (in TSM) for 
any given set of files is to use archive, and vary the management class (which 
maps to specific retention).

In v5, backupset performance has been improved -- especially, client-side 
restore.

BTW, this idea runs counter to the TSM-copypool & backup philosophy...
1.  if it's worth backing up, it's worth duplicating,,, or,
2.  Never trust your backup data to a single piece of tape!
3.  This scenario seems to ignore the possibility that a media failure (ie, 
either congenital defect or "the operator dropped the cartridge")

HTH.



Don France
Technical Architect -- Tivoli Certified Consultant
Tivoli Storage Manager, WinNT/2K, AIX/Unix, OS/390
San Jose, Ca
(408) 257-3037
mailto:don_france AT ayett DOT net (change aye to a for replies)

Professional Association of Contract Employees 
(P.A.C.E. -- www.pacepros.com)



-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
Edgardo Moso
Sent: Wednesday, March 12, 2003 1:20 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Creating two tape copies offsite with each has Different
Retention


Hello Fellow TSMERs,

This is quite a wild idea but I just would like to solicit your opinions if
how could I satisfy the the requiremetn asked by manager. He wants in one
backup instance to create two copies for the two copy storage pools one for
onsite and one for OFFSITE.  I know this can be done in TSM 5.1.  Aside
from this he added that each of this shoudl have different retentions.
Say, onsite is 15 days retention and offsite  is only 7 days.   I tried
reading the technical manual of TSM 5.1 but I think it's impossible to do
this unless I will apply the concept of backup set.    I don't think the
new features of TSM 5.1 inlcudes this. What do you think, gurus?

If I used the backupset, does anybody of you have experience on this?  How
does the backupset performance behaves in the new TSM 5.1?

Any ideas are greatly appreciated.

Thanks,

Edgardo Moso