On a similar note, I created a 1-drive STU for destaging because the 
DSSU has an annoying (and stupid) habit of allocating all available 
drives when it tries to destage.  Of course this makes all the streams 
(3 in this case) go slowly because they're all reading from the same 
DSSU spindles.  The 1-drive STU doesn't work.  I can't help noticing 
that the option says "Maximum concurrent drives used for backup"  (not 
duplication).  This must be a bug since it defeats the whole purpose 
of the DSSU, which is to keep the tape drive spinning.  5.1 MP5 Linux
(haven't tried it on MP4 yet).


----Original message----
Date: Thu, 16 Nov 2006 06:13:22 -0500
From: "Bobby Williams" <bobbyrjw at bellsouth.net>
Subject: Re: [Veritas-bu] Duplications running very slow

There was a known problem in 5.1 with duplication within the same storage
unit.

Just to see if this is hurting you (I have done this at my 18 different NB
sites), create a new storage unit in your library called "duplication".
Make it 1 drive, on demand only.  (you don't have to lessen the number of
concurrent drives in you other storage unit).

Try a duplication (manual or vault) and pick "duplication" as the
destination storage unit.

See if things speed up.


Bobby Williams
2205 Peterson Drive
Chattanooga, Tennessee  37421
423-296-8200


-- 
Joe Royer / SysAdmin / Digital Motorworks / 512-692-1028


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