> I never understood why some users wanted their disk storage pools
> mirrored when tape wasn't.

Ah, but tape can be "mirrored" as long as you create multiple copies of
the data on the first tape.

The best example I can give of an instance where you would want to mirror
your stg volumes would be when you are using either HSM or archiving the
data and then deleting the original files.  Then you are guaranteed that
if one of your disk vols is lost you would still have the data on a
second.

Then to avoid the single point of failure of the tape when you perform
migration would be to backup your disk pool to your primary tape pool
and then again backup your disk pool to your tape copy pool.


Joshua S. Bassi
Storage Management Team Lead
Tivoli Certified Consultant - ADSM V3
IBM Certified Specialist - AIX and
Mid-Range Storage Technical Solutions
Dickens Services Group
(404) 386-9848
jbassi AT gloryworks DOT com
www.TeamDSG.com