I don't know much about Solaris; however, I was recently experiencing
roughly the same performance and have since been able to tweak NBU to 4
concurrent streams running at over 15 MB/s each.  Start with these
articles.  If possible, set the SCSI tape buffer size to 64K (in Linux,
you have to edit a file and recompile the 'st' module).

http://seer.support.veritas.com/docs/183702.htm 
http://seer.support.veritas.com/docs/244652.htm 
http://seer.support.veritas.com/docs/242864.htm

Good luck.

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Ian Carter
Sent: Thursday, February 19, 2004 3:33 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Slow throughput?

Hi,

We've recently purchased netbackup business server for one of the
projects the
University is involved in, the details are:
Sun LVD L25 Jukebox attached to a V240 running Solaris 9. It's attached
using an Ultra 3 SCSI card. The jukebox has two HP Ultrium LTO 1 drives.

When backing up the host that the jukebox is attached to we get about
5MB/S throughput, which doesn't seem great to me. I was wondering if I
should be expecting more from this setup (I hope so!) and if anyone has
any suggestions about what to tweak.

Cheers, Ian

-- 
Computing Officer
Computing Service
University of Kent
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