I'll take a stab at this.

You now keep 10 versions of a file and you do a daily backup. It sounds like 
you want to be able to guarantee your ability to roll back or recover the TSM 
the server to 10 days ago. If that is the case you would need to make sure that:
        - The "delete volhist" command was changed to keep 10 days of DB tapes.
        - The resuse delay on empty tapes should be set to 10 days also.

        And yes, you will want to keep the last 10 days of DB tapes offsite to 
meet your DR objectives.

        In our situation, our default management class keeps "up to 5 copies of 
a file up to 30 days. And we keep the last couple versions for 180 days once a 
file is deleted." Does that mean we should keep 30 days worth of DB tapes? No. 
we keep a week's worth of DB backups offsite for DR because we could never 
really seeing ourselves rolling back the TSM server 8 days. It think that 1 or 
2 weeks is pretty standard for folks on this list.

Ben
 

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Paul Dudley
Sent: Monday, April 10, 2006 10:49 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Resend - Policy and DRP question

I sent this query a week ago but have not received a reply back. I am resending 
in the hope that someone can offer some advice.

We have TSM version 5.2

I have changed the standard policy so that we now keep the 10 latest versions 
of each file rather than 7.

I have also changed our del volhist to tod=today-10 where it was previously 7.

I have been told that previously we had to keep the 7 latest copy tapes and db 
tapes offsite for DRP to ensure that we could recover complete servers. With 
the changes that I have made does this mean that we have to now keep the 10 
latest tapes offsite for complete DRP?

 
Paul Dudley
ANL IT Operations Dept.
pdudley AT anl.com DOT au





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