I don't know how it works on MVS, but you might look further into it.
Because on my AIX V2 server a restore request will pre-empt reclamation
processing, dismount the tape, and mount the tape for the restore
automatically.

> ----------
> From:         Wendrock, Richard O[SMTP:wendrro AT texaco DOT com]
> Sent:         Thursday, February 19, 1998 11:06 AM
> To:   ADSM-L AT vm.marist DOT edu
> Subject:      Re: Planning for tape requirements for MVS
>
> Christo,
> Thank you for the reply...  If I understand correctly... If ADSM
> receives a
> recover request during backup, collocation or reclamation processing
> and all
> drives are in use then my customer must wait for a tape drive to
> become
> available(which could be hours).  It all depends on the number of
> available
> tape devices and the number of allowable tape sessions within ADSM...
> Regards,
>
>
>
> > ----------
> > From:         Christo Heuer[SMTP:christoh AT ABSA.CO DOT ZA]
> > Sent:         Thursday, February 19, 1998 7:58 AM
> > To:   ADSM-L AT VM.MARIST DOT EDU
> > Subject:      Re: Planning for tape requirements for MVS
> >
> > Hi Richard,
> >
> > Adsm will request a standard MVS mount for a tape - if
> > you do a restore it will be a specific mount or if you are
> > backing up it might ask for a scratch when the tape is
> > full.
> > I don't think there is a priority in the sense that restores
> > will have a higher priority than backups. In your device
> > class you set the mount limit - this is how many drives
> > adsm can use. If the mountlimit is reached it will wait
> > for a tape drive to become available.
> > (So it is more a sequential thing - it uses the drives
> > in the order that the requests come in, whether they
> > are for backup/restore does not matter).
> > The management of the tapes ADSM does - we also
> > use RMM and it works with RMM.
> > In your device class for your tape drives you specify
> > how many drives adsm can use and also what the
> > mountretention should be. If your mountretention
> > is set to 15Min Adsm will unmount the tape 15Min
> > after the task that was using it stops using it.
> >
> > Hope this helps
> > Regards
> > Christo Heuer
> > ABSA Group
> > Johannesburg
> > SOUTH AFRICA
> >
> >
> >
> >
> > >I am trying to determine how many tape drive we will need for ADSM
> on
> > MVS.
> > >
> > >How does ADSM manage tape drives on MVS?
> > >
> > >Is there a priority amongst ADSM subtask?  Does a request for
> recover
> > carry
> > >a higher priority over backup?
> > >
> > >When does ADSM release a tape drive? (at end of tape or end of
> task)
> > >
> > >
> > >Regards,
> >
>