ADSM-L

Re: synthetic fullbackup

2002-12-18 09:24:54
Subject: Re: synthetic fullbackup
From: Richard Sims <rbs AT BU DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Wed, 18 Dec 2002 09:21:11 -0500
>We are looking for a solution for the following problem:
>During a restore of a whole TSM-client we found that the needed ACTIVE
>backup_versions were heavy scattered around our virtual tape-volumes. This
>was the main reason for an unacceptable long restore-time...

Werner - As Geirr said, Backupsets are the optimal solution but, as all
         solutions, will require extra processing time.
Another approach is to exploit the often-unexploited MIGDelay value, on
the primary tape storage pool.  Try to match that value to your dominant
Copy Group retention value, and migrate older files to a next, tape
storage pool, and let reclamation naturally bring bring newer files
closer together.  This should get inactive versions out of the way.
The cost is extra tape data movement.

There is no "ideal" solution.  Opportune full backups (weekend?) will
get you closest to what you want.

  Richard Sims, BU

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