From: "Rock VZ" <rockvz@hotmail.com>
Subject: nfs disk utilization in terms of stress
Date: Tue, 22 Feb 2005 22:08:42 -0800
Message-ID: <BAY12-F241086A8C3CD873B2A1DDCD6630@phx.gbl>
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To: nfs@lists.sourceforge.net
Sender: nfs-admin@lists.sourceforge.net
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Hi,

I would like to know how to get  disk utilization stats (like the one iostat 
gives - %util) from a nfs client.
With nfsstat -c I can get the read/write ratio but I am interested more 
in-terms of "stress".
For example
I would like to calculate the stress average by taking the delta of  
/proc/net/rpc/nfs between 2 time intervals and calculate percentages based 
on total rpcs "possible" rather the rpcs that occured in that interval.
i.e.
Even if  only one rpc read call is made then based on nfsstat calculations 
it would show a 100% read but it does not mean that the mount point was 
'fully utilized' in reading.

How can I know the max. rpc calls possible and then calculate the 
percentages based on this value.
Or is there any other way to get nfs "stress" stats.
I'm trying to tune the nfs load so that it operates at 80% utilization. How 
can I determine such stats?
We use nfs over tcp (2.4 or 2.6 kernel)

Thanks in advance
Rock

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