Hi Tom,

     This is a classic.

     People are used to thinking about backups in terms of "how long do we
     keep this backup?". In the ADSM world, this is not backup. Backup is
     specified in a number of versions, and how long to keep extra
     versions.

     You are looking at what ADSM calls archiving. With an archive you
     specify the number of days to keep.

     Archive uses days to keep, backup uses number of versions.

     There is no clean way to keep backupped versions of a file for a
     specific period of time. And I too sometimes wish there were.

     Bye,

     Chris Roelofs
     Mainland Sequoia


______________________________ Reply Separator
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Subject: <no subject>
Author:  "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> at inet-1
Date:    23/12/1998 7:33 AM


Hi,

does anybody know a workable solution for the following demand on
policies my management agreed on with our customers:

We want a daily incremental backup,
 once a month a full backup, which should be kept for 1 year
  once a year one of these month-backups should be kept for 15 years.

(looks a lot like the son-father-grandfather principle)

My site is looking at about 500Gb backed up data, which will be
2 Terabytes next year.
Our adsm server runs on aix, with a 3494 robot (3 3590 drives)

Thanks , and happy holidays, Tom


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