Hello all,

We have a fairly new ADSM installation, and are primarily making use
of ADSM's HSM capabilities.  In a typical configuration, a local
filesystem on the HSM client (Unix) migrates data to a primary disk
storage pool on the (AIX) ADSM server, which in turn migrates to a
primary tape (3590) storage pool.  I want to ensure that all the data
under HSM control is backed up to protect against media (disk or tape)
failure.  However, I'm unsure as to the best way to do this ("best"
being a method that combines complete backup with easy (preferably
automatic) recovery of data).  Given the above configuration, complete
backup means that the local disk on the HSM client (containing stub
files and unmigrated data), the disks in the primary disk storage
pool, and the tapes in the tape storage pool are all backed up.

From what I've read in the manuals, the normal way to backup the HSM
filesystem (local disk plus data migrated to storage pools) is to
simply use the ADSM backup client.  This sound fine, except how is
file recovery handled?  If a file somewhere in the HSM system (local
disk, disk pool or tape pool) is damaged, does ADSM automatically
recover the file from the backup storage pool used by the backup
client, or must one restore the file manually?

In the ADSM Admin Guide, it describes how to use copy storage pools to
back up primary storage pools.  Using a copy storage pool has the nice
feature that if a file in a primary storage pool is damaged, ADSM will
automatically retrieve the file from the backup in the copy storage
pool, without requiring operator intervention.  However, the copy
storage pool only backs up primary storage pools; it doesn't backup
the local filesystem residing on the HSM client, so there is the
potential of losing unmigrated data (and stub files, although it
sounds like these can be restored using dsmmigundelete).

Is there any way to combine the comprehensive backup of the
backup/archive client with the automatic restoration of copy storage
pools?  If so, how?

John

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John Valdes                        Department of Astronomy & Astrophysics
John Valdes                        Department of Astronomy & Astrophysics
j-valdes AT uchicago DOT edu                               University of Chicago