Hi Tom;

     I have seen similar results.  If you only have one process
backing up then straight to tape can be more efficient.  If several
are running, only one can talk to a tape drive at a time and the
others all have to wait.  You implied that you have multiple drives
in your library so more than one tape can be mounted.  Another
consideration is the time it takes to mount a new tape.  If that
doesn't take too long then you are ok.  Almost any other process
requesting tape access will have higher priority over your backups.
 Restores or migrations may cause your backup to pause.

                                                                      -Bob-

>>> Tom Stewart <tstewart AT US.IBM DOT COM> 06/05/97 09:25am >>>
Hello -

 I'm very new to the ADSM world and have a question concerning
backing up
clients (in my case other AIX servers)
directly to high performance 3590 tape drives in a 3494 library.

I've noticed that when I backup to my disk storage pool located in a
8 way R30
with 2 gig of memory and 120 gig of
SCSI disk space, that backups take about twice a long as going
directly to one
of my primary tape pools, has anyone experienced this?

Is there any advantage of going direct to disk rather than to tape
(other than
speed of recovery of files, i.e. no mount
wait time)?

Thanks for any input.

Tom Stewart
HONE/IBMLink AIX Support
Boulder, Colorado
8/347-2786
tstewart AT us.ibm DOT com
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