From: Peter Staubach <staubach@redhat.com>
Subject: Re: NFS performance tuning
Date: Fri, 06 Jan 2006 12:48:04 -0500
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References: <43BE9EC3.3090108@totalflood.com> <1136567265.7839.25.camel@lade.trondhjem.org>
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Cc: Stephen Carville <stephen@totalflood.com>,
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To: Trond Myklebust <trond.myklebust@fys.uio.no>
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Trond Myklebust wrote:

>On Fri, 2006-01-06 at 08:45 -0800, Stephen Carville wrote:
>  
>
>>I have NFS server running on a Dell 2850:
>>
>>   Name: Amazon
>>    CPU: 3000 Mhz Xeon  (X2)
>>Memory: 2G
>>   Swap: 8G
>>     OS: Fedora Core 3
>>    NFS: Version 1-4
>>
>>I export a 150G volume thusly:
>>
>>/NFS/tigris_backup
>>10.1.1.0/24(rw,wdelay,nohide,insecure,root_squash,no_subtree_check,anonuid=65534,anongid=65534)
>>
>>The client is a Dell 2650 running Oracle 9i
>>
>>   Name: Tigris
>>    CPU: 3200Mhz Xeon (X2)
>>Memory: 8G
>>   Swap: 4G
>>     OS: Redhat ES 3.2
>>    NFS: Version 2/tcp
>>    
>>
>
>Why are you using NFSv2? That forces the server to use synchronous
>writes (i.e. each write must be committed to disk before the server
>replies to the client) and is very inefficient.
>
>If your application is write-intensive, you should always choose NFSv3
>or greater.
>

There might also be some benefits from using the larger transfer sizes 
available
in NFSv3 or greater too.  NFSv2 is limited to 8kB transfers, which is 
kind of
small for the larger bandwidth networks, especially in conjunction with 
the use
of TCP to minimize any possible retransmitted packets.

    Thanx...

       ps


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