Think that depends on what you have set ResourceUtilization to in your client's 
dsm.opt file.  If you set Resource Utilization to 1 then one drive set to 2 
then 2 drives.  If you go to disk first you can set to as many as you like 
(with in reason and or based on the number of filesystems your client has).

Hope this helps.

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
Chernyaev Sergey
Sent: Wednesday, January 12, 2005 8:24 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Hypothetical question


Hello

If in moment of time runned backup only of one node and library have 2
drives, data will be write on tapes in both drives or on one drive? I
can't remember and can't find info in documentation (((

WBR,

Sergey