If you look at the file system it self you'll see that there is a folder
(for the read only part) present
This makes it possible for the disk to be written at and read from at the
same time.
On a standard disk you can only do one thing at a time like on a tape.

If you want your disk to act like a sort of tape you should use standard
file system disk .
Are you using any other means of backup like real tapes than configure
staging of your data from advanced file system to tape after a certain
amount of time or if a maximum % of disk usage has been reached. 
This will effectively move your data to tape after maximum threshold has
been reached

If you want the data to be overwritten you have to create a retention that
makes the data over the date before your disk (single) runs full ,as it
were.

All this info is available in the manuals but you need to play a round with
it a lot to really appreciate the possibilities in full :)


-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Ken Kleiner
Sent: 06 November 2007 22:59
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Utilizing 2 adv_file devices in 1 pool

Hi,  I have 2 adv_file devices in a backup pool - I just added the  
2nd one today.   When the first one is full, shouldn't the 2nd one be  
automatically used?  That's not what is happening - I'm running
7.2 on a linux platform.  Thanks.

Ken Kleiner
System Manager
UMass Lowell
Computer Science Department
(978) 934-3645
ken AT cs.uml DOT edu

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