12.5 MB second  is what you can achieve for each nic -
With lto-2 - the drives are awesome - with fiber they can get
33 MB sec, so 177MB sec = nic cards slowing them down,
-----Original Message-----
From: Paul Keating
To: dave.markham AT fjserv DOT net; veritas-bu AT mailman.eng.auburn DOT edu
Sent: 12/21/2004 8:41 AM
Subject: RE: [Veritas-bu] data buffers tuning etc on netbackup 5 and LTO
drives



> -----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 
> Dave Markham
> Sent: December 21, 2004 11:39 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] data buffers tuning etc on netbackup 5 
> and LTO drives
> 
> I was wondering is this still neccessary for performance improvements 
> with netbackup 5mp3 ?

Absolutely.

> Im running on Solaris 9 with LTO2 tape drives. I just doing a test 
> backup and although i dont rely on it the job tasks is saying its 
> getting 3800kbps which to me is very slow for LTO2.

I'm running Solaris 8, with LTO2 drives, and NB5MP3

If you're getting 10 jobs multiplexed to one tape, and getting 3800KB/s,
*PER JOB* then you're about at the native write speed of the drive.
(35 or so MB/s)

I've occasionally gotten upto 60-70 MB/s to one drive, depending on the
compressability of the data.....but average is lower than
that....usually around 45000-50000 KB/s (~40-50MB/s)


Paul

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