You cannot have "migration" back to disk pool - TSM will not allow you to
create closed loop of pools and pool of type DISK cannot be set as
reclamation pool.
You have to define pool over devclass of type FILE and set it as
reclamation pool to the tape pool. And the size of file pool does not need
to be large as for the disk one. Its size can be no larger than ammount of
data to be reclaimed from a tape. Example: DLT 8000 with estimated
capacity 80GB, reclamation threshold 60% gives 80GB*(100-60%)=32GB
reclaimable data. If you are in heavy constraint you can shrink further
reclamation pool but either reclamation will run in two passes or you have
to increase reclamation threshold.

Zlatko Krastev
IT Consultant




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Subject:        Space reclamation to tapepool

Hello TSM'rs

I have a question. Here's my senario, We backup to disk. Then Migrate to
tape once the backups complete.
I have a single drive tape.
the disk capacity is not enough to create another stgpool.
I want to execute the processes of space reclamation to the tapes.
Do I have some risk if it emigrates again from the tapepool to the
diskpool
for tapes with 2% use?
That cautions should take?

your assistance is greatly appreciated.
Thanks,

Carlos R. Bravo Arredondo
cbravo AT bsantander.com DOT mx
Tel. (55) 51741924