[Veritas-bu] duplication
2002-07-25 16:57:23
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
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