Here's what I've done:

NET_BUFFER_SZ = 262144
NUMBER_DATA_BUFFERS = 16
SIZE_DATA_BUFFERS = 65536

All entries in /etc/system are verified as correct and all of them are
present according to the tech doc.  Calculated shmem is based on new
values for SIZE_DATA_BUFFERS and NUMBER_DATA_BUFFERS, 4 drives, and a 4
mpx per drive.

I rebooted the server and I still get <1mb/sec on a duplication job.  A
single unix client network backup runs at >8mb/sec so it's not tcp stack
or nic problems.  And again, there is no mpx issue since this data is
ndmp.

Server is:

Sun E250, 2 X 400MHz, 2gb ram, /usr/openv on A51000 striped/mirrored
aray, tape drives are HVD scsi direct attached.

Anyone have any ideas?  Case open with Veritas but no answer yet. 
Thanks.

~JK

> "Donaldson, Mark" wrote:
> 
> Check your buffer settings.  This, and a demux source, made a
> difference for me.
> 
> See: http://seer.support.veritas.com/docs/183702.htm
> and: http://seer.support.veritas.com/docs/243197.htm
> 
> FWIW: I get much better performance on my DLT7k (ultra-diff) than your
> 1mb/sec rates.
> 
> -M
> 
> -----Original Message-----
> From: Jeff Kennedy [mailto:jlkennedy AT amcc DOT com]
> Sent: Wednesday, July 24, 2002 11:56 AM
> To: NBU List
> Subject: [Veritas-bu] duplication
> 
> I don't duplicate much but does it always run slow?  I am seeing an
> average read/write of 1mb/sec for a duplication on dlt7k drives
> attached
> to the master server.  The primary copy is an ndmp backup so there's
> no
> multiplexing involved.
> --
> =====================
> Jeff Kennedy
> Unix Administrator
> AMCC
> jlkennedy AT amcc DOT com
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

-- 
=====================
Jeff Kennedy
Unix Administrator
AMCC
jlkennedy AT amcc DOT com