Re: Filespace collocation not working as it should

HEllo,

in between, if you want to accelerate things, you can use the MOVE DATA
command to copy your tapes back into the corresponding storage pool on disc.

Your 11 sessions will then be much faster, no more tape mounts! We use that
for restoring SAP data using Backint and // sessions.

Regards,

Rene Lambelet
Nestec SA - 55, Av. Nestle - CH-1800 Vevey
Tel: ++41'21'924'35'43 / Fax: ++41'21'924'45'89
E-Mail: rene.lambelet AT nestle DOT com



> -----Original Message-----
> From: Shafiee A. Jalil
> [SMTP:Md-Norshafiee.B.Abd-Jalil AT OPENMAIL.FIC323.BSPSER.SIMIS DOT COM]
> Sent: Monday, February 15, 1999 9:16 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Filespace collocation not working as it should
>
> Our environment:
> ============
>
> Server:
> ADSM  V3.1.1.5
> IBM R40
> 3494 Tape Library with 2*3590 drives
>
> Client:
> HPUX
> ADSM V3.1.0.0
>
> We have set up filespace collocation on one of our storage pools. This
> storage pool only has one client with about 11 filesystems on it. There
> are about 20 tapes available for this filesystem and each filesystem is
> less than 1 GB. This means that each filesystem occupies one tape.
>
> We attempted a full restore for this client by running multiple restore
> sessions (11 sessions).  Since we only have two tape drives, this means
> that the server can only handle two restores at one time while the
> other sessions remain in "Media Wait" states.
>
> What we found was that ADSM keeps switching between these 11 sessions.
> It does two restore sessions, stops,  does a restore for another
> session, stops, goes to another, comes back to the first session and so
> on. Furthermore, it seems that it chooses the sessions at random. As
> you can expect, the restore generated a LOT of tape mounts as each
> filesystem uses an individual tape. This means that it keeps coming
> back to the same tape whenever it chooses a session which it has
> serviced previously.
>
> My question is why does it not finish off one session first, after all,
> as mentioned, each filesystem being restored is on an individual tape.
> Is there a parameter that determines the amount of time spent each
> session or is this a bug?
>
> Thanks in advance.
>
> Shafiee.
> ADSM Support,
> Brunei Shell Petroleum.