FW: [Veritas-bu] SIZE/NUMBER_DATA_BUFFERS and slow duplications

-----Original Message-----
From: Andy Skates [mailto:andyskates AT iname DOT com]
Sent: 10 August 2001 07:22
To: 'larry.kingery AT veritas DOT com'
Subject: RE: [Veritas-bu] SIZE/NUMBER_DATA_BUFFERS and slow duplications


Reading the Technote on this subject, I got the impression that
you have to change the NET_BUFFER_SZ setting on ALL the NBU
servers AND the clients. Do you know if this is the case?



-----Original Message-----
From: Larry Kingery [mailto:larry.kingery AT veritas DOT com]
Sent: 09 August 2001 15:55
To: Andy Skates
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] SIZE/NUMBER_DATA_BUFFERS and slow duplications


Since I just saw this elsewhere with duplication on NT, I'd suggest
setting the NET_BUFFER_SZ up on the media server (if it isn't already)
which is doing the duplication.


Andy Skates writes:
> We have 10 x 9840 FC tapes drives attached to Brocade Silkworm
> switches. We're running NBU DataCentre 3.4 under NT 4.
>
> I'm not so worried about our backup times, however, we are getting
> really slow duplication times, and I mean really slow!
>
> Our backups are multiplexed and we're using BPVault to do
> our duplication, with multiplexing set to 1.
>
> My questions are:
>
> 1.    Are other people getting slow throughput when duplicating?
>
> 2.    Has anyone tried turning off multiplexing for the duplicates to see
>       if this improves times?
>
> 3.    Does the entry in BPTM 10:57:39 [244.376] <2> mpx_read_data:
>       waited for empty buffer 17844 times, delayed 34819 times indicate
>       that I need to try tuning the size/number of data buffers.
>
>       If so has anyone tried doing this in an environment with NT 4 NBU
servers,
>       Brocade Silkworm SAN switches and FC attached 9840s?
>
>
> Thanks,
>
> Andy Skates
> Legal & General Assurance PLC
>
> andyskates AT iname DOT com
>
>
>
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--
Larry Kingery
       If at first you don't succeed, skydiving isn't for you.