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,