Veritas-bu

[Veritas-bu] Backing up through NFS

2002-05-15 13:07:01
Subject: [Veritas-bu] Backing up through NFS
From: larry.kingery AT veritas DOT com (Larry Kingery)
Date: Wed, 15 May 2002 13:07:01 -0400 (EDT)
First, let's assume that the tape drives, SCSI, etc are not the
bottleneck, and that your Gb card and switch port settings are all
configured correctly.

What is the network layout?  If there's a 100Mb connection between two
routers that all of your clients have to cross, that Gb isn't going to
do anything for you.

I would suggest the O'Reilly NFS/NIS book.  It's got a very good
section on NFS client performance tuning.

BTW, what you're trying to do is mutlistreaming, multiplexing is
when you write multiple streams to the same drive at the same time.


Nicholas O'Deegan writes:
> I was wondering if anyone out there has thoughts on the following:
> 
> I have two servers, one Master/Media the other Media.
> 
> The Media(only) server has a library attached with a drive that can write at 
> 10+ MB/sec. 3 machines are mounted to generic mount points on the Media(only) 
> server (which has a gigE card) 
> 
> e.g. /data/mount1/
>      /data/mount2/
>      /data/mount3/
> 
> A backup policy was created to have the Media(only) server back itself
> up on these mount points. However, the transfer speed maxes out at sub 
> 10 MB/sec speeds. This was expected. I imagine each machine is only able 
> to serve its data up (over NFS) at around 7-9 MB/sec via a 100 Mbit 
> connection.
> 
> So, how do I speed this up without purchasing additional client
> licenses? I tried mulitplexing, e.g.
> 
> NEW_STREAM
> /data/mount1/
> NEW_STREAM
> /data/mount2/
> 
> I figured, because the streams are coming from separate NFS mounts and
> thus separate machines, it would send data faster, but no dice. It
> actually increases the load on my Media(only) server without any gains
> in performance.
> 
> 
> new to this game,
> 
> 
> odeegan
> 
> 
> 
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-- 
Larry Kingery 
         If you can't beat them, arrange to have them beaten.

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