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,
>