Hi Betsy,

if you have a deviceclass of file you will only define a directory in that
deviceclass.

In that directory you might have up to 256 files that can be simultaneously
accessed
according to the mountlimit value of that deviceclass.

In this case a file is treated like a sequential volume - "mounted"

The Admin Guide in this case is really confusing cause a storage pool is
only working with
a deviceclass and there you might have a mountlimit of 1 or only one drive
in a library with a
mountlimit of drives.

For a copy process you will need enough mount points available - a drive
being used by another process is physically there but there's no mount
point available from that drive.

Hope this helps a little to understand why a mount point and a drive are
not the same.

Regards
     Mecki