We perform reclimation processing on our offsite tapes over the
weekends. This process usually takes from 4 to 10 hours, depending on
how much data is being moved.(We use 20gb DLT tapes) We keep offsite
reclimation set to 100%, and use the scheduler to reset it to 60% for
the processing, to insure that we can combine all the data from two
tapes onto one. (If you set it to 40%, and have two full tapes that have
40% reclaimable space, then you will wind up with 2 new tapes, one full
and one at 20%)

Assuming that you have a primary storage onsite, and keep copy pool
tapes offsite, you don't need to bring offsite tapes onsite. As long as
you mark all offsite tapes as offsite, ADSM will use your local primary
tapes to create the new tape(s). You then send the new tapes offsite and
have the empty tapes returned for scratch.

We perform reclimation for onsite tapes as needed, a volume at a time.

The time required depends on the speed of your tape drives, and the
capacity of the tapes.

Nicolas Clerc wrote:
>
> Hi ADSMers,
>
> We are using ADSM 2.1.0.6 on AIX 4.1.5
> We are currently planning our ADSM configuration.
>
> I worry about the Reclamation process and I have some questions :
> - How long does the Reclamation process take every day to ADSM  ?
>   to the administrators (move back offsite volume for Reclamation,
>   mount each volume, ...) ?
> - Do we have to plan a lot of time for this task ?
>   It probably depends on the number of volume and on the reclamation threshold
>   you choose.
> - When is it performed ? After the daily backup, before the backup ?
> - In order to avoid worrying about it every day I suggest this configuration:
>   We set the reclamation threshold to 100% so that reclamation
>   is not performed every day. Once a month we change the reclamation threshold
>   to 40% and we work on it during the whole day.
>   Is it a good idea ? Why not ? What do you suggest ?
>
> Any experience in this area will be appreciated.
>
> Thanks in advance.
>
> Nicolas Clerc.
>
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