From: Matt Schillinger <mschilli@vss.fsi.com>
Subject: NFS Tuning
Date: 15 May 2003 06:24:45 -0500
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For NFS Version 3, is there a formula to help administrators tune NFSD
to their environment?

I'm looking at thread count, and obviously see the advantages that
adding threads to a server that is experiencing large number of thread
overutilization, but I am wondering if there is a way to best calculate
the threads needed.

Such as:

CPU Speed:

RAM: 

Total Bandwidth of Serving Network Interfaces, and How many network
interfaces served:

Number of Clients: (Would OS of clients affect - are some 'more
efficient consumers than others?)

Equals: How many threads this machine can handle or should be using.


Also, another tuning item i found was for Memory limits for the input
queue.  It recommends 256K for a standard install, as opposed to the
default 64K.

Standard setup has 8 threads, so 256K gives each thread 32K input queue.
For 16 threads, does the calculation still hold true? (512K input queue=
32K/thread)  What are the signs that can allude to input queue problems?

I'm just trying to tune my servers in a less than trial and error
method.


Thanks for your help,


-- 
Matt Schillinger
mschilli@vss.fsi.com


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