Hi Burak,

You can prevent clients from accessing tapes directly:
update node ** MAXNUMMP=0

This prevents the node from grabbing a tape drive for backup or archive (it
can still get a tape for RESTORE or RETRIEVE).

However, with MAXNUMMP=0, if there is not enough space in the disk pool when
the client tries to back up, then the backup will fail!

So, first try these things:

*       Set your migration threshhold LOWER than 60%, so migration will
start sooner.
*       Try to reschedule your client backups so there is more time for
migration to clear out the disk pool before the next client starts.
*       Add space to your disk pool.