From: Hugh Caley <Hugh_Caley@affymetrix.com>
Subject: How many nfsd's can I run?
Date: Tue, 21 Jun 2005 19:02:04 -0700
Message-ID: <42B8C69C.6010302@affymetrix.com>
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Often when a cluster run (100+ nodes) is started my NFS server will get 
very slow; users with their home directories on the server will lock up 
for short periods, and the load average crawls higher.

The output of cat /proc/net/rpc/nfsd:

th 125 264502 142948.997 38666.037 22620.179 16494.577 10072.689 
5700.113 2623.322 1094.785 474.752 1900.536

This would seem to mean that my nfsd threads are runnning at 100% for 
much of the time, meaning I need more nfsd's, correct?  But is there a 
limit to the amount of nfsd's I should run?  I had had it as high as 150 
at one time, but it seemed to me this made the server less stable.  
There may have been other reasons for this, however.

Anyway I have since doubled the ram on the server (to 8 gig).  Machine 
is a dual Xeon 2.6 Ghz machine running Fedora Core 2, kernel version 
2.6.10-1.771_FC2smp, gigabit ethernet.  Can I run more nfsd's, or should 
I be looking for other problems?

Hugh

-- 
Hugh Caley | Unix Systems Administrator | CIS
AFFYMETRIX, INC. | 6550 Vallejo St. Ste 100 | Emeryville, CA 94608
Tel: 510-428-8537 | Hugh_Caley@affymetrix.com


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