Any primary storage pool, whether disk or sequential-access, can be
backed up to a copy storage pool.  So yes, your disk pool can be
backed up to tape.  Once a file has been backed up to a copy storage
pool, the file can be moved to another primary pool and the copy in
the copy pool is still valid (provided, of course that the copy does
not get deleted or damaged).  Thus, if you can back up your disk pool
before files migrate to tape, you will not need to perform a backup from
tape to tape.  However, you may want to do so to ensure that you have
backup copies of any files that get migrated before the disk pool is
backed up.

Dave Cannon
ADSM Development
------------------------------- Referenced Note ---------------------------
My primary backup storage pool is a string of discs. When the migration
My primary backup storage pool is a string of discs. When the migration
limit is hit files get moved to a tape storage pool (DLT4700, single
drive). To ensure I always have multiple copies of the file I want to
make use of the copy storage pools facility. I may be missing somthing
quite obvious in the documentation but a still have a  few questions:


* To ensure that the primary disc pool is safe is it work making a copy
of it  to a copy pool for recover in the event of a disc failure.

* Can I use a tape copy pool to make a copy of the primary disc storage
pool? The documentation appears to imply not.

* If yes can I make use of the above copy in the event that a tape
files have been migrated to gets destroyed? From the documentation it
appears not. If I can't use this mechanism then I assume I have to have
at least two identical tape drives to make a tape copy pool.

* When a file gets deleted from the ADSM server, e.g. file does not
exist on users workstation and  the grace period has expired,  does the
copy pool version have to be available for it to complete or can the
copy pool version be off-site.

* What schemes do you have in operation in the event of a disaster like
disc/tape or data integrity failure and have they proved successful if
you have had to use them?


Thanks,
Paul Walmsley