>  How many savesets clone at a time for a single advanced file disk
device?

One at a time...   Disk to tape cloning results in completely
unmultiplexed savesets on tape.


>  When cloning is running can I perform a restore?
>  When staging is running can I perform a restore?
>  When staging is running can I perform cloning?

All of these questions are essentially the same thing...   Prior to 7.3
adv_file devices support only one read session at a time, either a
restore or a clone, other requests queue.  From 7.3 onwards there is no
limit to the number of restores in parallel with a cloning operation. I
have not yet tried running more than one clone at a time though.


>  If I cant restore during staging/cloning then can I prioritize a
restore so that if cloning or staging is taking place, and I initiate a
restore, then the restore will start and the cloning /staging will
pause.
 
No, unless you run 7.3+  
   
>  Our Cloning is running at 10mb/sec from disk to tape? The speed does
not change no matter if the saveset contains one single file
> (exchange database) or many files (fileserver). 
>  Where is the speed restriction likely to be - the number of savesets
that clone at once; the read access from the disk; or the tape >  device
(LTO Ultirum).

What sort of LTO   (1 2 or 3?)    10MB sounds about right for LTO1.
the bottleneck for cloning from disk is usually the tape drive. However
with LTO3 drives being as fast as they are you may find the bottleneck
is disk read speed...

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