ADSM-L

Re[2]: Collocation and Disaster Recovery

1998-06-15 03:26:00
Subject: Re[2]: Collocation and Disaster Recovery
From: Carl Makin <Carl.Makin AT IPAUSTRALIA.GOV DOT AU>
Date: Mon, 15 Jun 1998 17:26:00 +1000
> Author:  John Dawson <jdawson AT TKG DOT COM>)

> To pick a simple, but reasonable, case, let's say you have 100 nodes
> being backed up; each node's data can fit on one tape; and the
> nightly backup traffic will fit on three tapes.

> How many tapes do you take offsite, each day, if your copy pool ...
>  A) is not collocated:  three (3)
>  B) is collocated:  one hundred (100)

How about limiting the number of scratch tapes that your copypool can have?
>From what I understand, ADSM will co-locate up to the limit of the number
of scratches allowed and then go back and add extra nodes to existing
tapes.

If you limit the pool to just a few tapes more than the total capacity
required you should end up with a "few" nodes on a single tape rather than
data everywhere.


I haven't tried this though. ;)  I'm in the middle of the nightmare of
creating a copypool when we already have 35 tapes full of data. :(


Carl.