Thomas,

     Are you running VTSI or VTSII from IBM?  We are planning an
implementation in September.  We do not plan to run either ADSM or DFHSM to
the VTS.

                         Thanks,

                         Ginny
---------------------- Forwarded by Virginia L Hysock/GIS/CSC on 07/08/99
09:23 AM ---------------------------
09:23 AM ---------------------------

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Virginia L Hysock/GIS/CSC
07/08/99 08:30 AM

To:   Virginia L Hysock/GIS/CSC@CSC
cc:
Subject:  VTS

Date:    Tue, 6 Jul 1999 11:38:35 -0400
From:    Thomas Denier <Thomas.Denier AT MAIL.TJU DOT EDU>
Subject: VTS mount times
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My site is using an IBM 3494 tape library with a VTS (Virtual Tape Server)
to
store ADSM data.
Most specific volume mounts of virtual tapes for ADSM take about five
minutes.
I understand that the process is more complicated than mounting a real
tape,
but even so, five minutes does not seem an impressive performance for what
is
advertized as a highly advanced tape technology.
I have occasionally seen virtual tape mounts for ADSM take forty minutes or
more with no obvious cause. The people who manage the VTS insist that these
episodes are normal behavior (they usually say something about the length
of
time required to forward space a ten gigabyte stacked volume). I find this
claim implausible in the extreme, but I don't know how to refute it.
Are there any IBM documents with concrete data on the expected mount times
for
virtual tapes?