Well, isn't it actually the other way around? You should set your
REUSEDelay to the amount of days you keep your database backups.
In case of a failure you will probably always want to restore the most
recent database backup, but if that one fails too for some reason, you
will have to fall back on older database backups. Of course this means
losing backup information and it's for your shop to decide what is
acceptable.
We keep our database backups for 3 days (twice a day) and thus the
REUSEDelay is set to 3 days. Since we don't use physical tape I think 3
days (equals 6 backups) is long enough.
Keeping database backups for a longer period of time means a higher
REUSEDelay and thus requires more scratch volumes.
Kind regards,
Eric van Loon
AF/KLM Storage Engineering

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Ehresman,David E.
Sent: maandag 17 februari 2014 15:31
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Database Backup best practice

You should keep at least as many TSM DB backups as the largest
REUSEDelay on your storagepools.

David

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Tom Taylor
Sent: Monday, February 17, 2014 9:27 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Database Backup best practice

Good morning


Running TSM 6.3.4




        I have read the admin guide best practice section on backing up
the database and I have also done some google searching but I cannot
find a straight answer on this... How many backups of the database
should I keep available? I always do a full backup, is there any reason
to keep any of the older full backups if I have a recent good one?








Thomas Taylor
System Administrator
Jos. A. Bank Clothiers
Cell (443)-974-5768
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