Number of concurrent drives and (depending on platform) IPC resources.
Specifically shared memory and semaphores. If you do not have enough
semaphores defined for IPC resources then you will limit the number of
concurrent drives in use due to an IPC resource shortfall.
 
Bill

________________________________

From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Bob
Stump
Sent: Wednesday, December 06, 2006 2:32 PM
To: i node; veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Not Using all Tape Drives


check the storage unit definitions for max concurrent drives

>>> "i node" <clri.c0t0d0 at gmail.com> 12/6/2006 4:20 PM >>>

I've begun monitoring tape drive usage, and comparing it to 'bpdbjobs
-summary' output every X minutes.  I've found that we consistently have
at least a quarter of our drives empty, even during our busiest times,
with many backup jobs queued.  How can I determine why these drives are
not getting used? 
 
Thanks in advance
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