From: Ian Thurlbeck <ian@stams.strath.ac.uk>
Subject: Re: Strange delays on NFS server
Date: Wed, 11 Aug 2004 17:08:45 +0100
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <411A448D.3080205@stams.strath.ac.uk>
References: <4119FB15.7010205@stams.strath.ac.uk> <411A17F2.2060203@RedHat.com>
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Cc: nfs@lists.sourceforge.net
To: Steve Dickson <SteveD@redhat.com>
In-Reply-To: <411A17F2.2060203@RedHat.com>
Errors-To: nfs-admin@lists.sourceforge.net

Steve Dickson wrote:
> 
> 
> Ian Thurlbeck wrote:
> 
>> I am getting strange delays on our NFS server. Everything will
>> be fine for maybe 5 to 10 minutes, then saving a small text file
>> from a client machine will suddenly take 15 seconds or more.
>> Similarly, mozilla will pause accessing a page for ages ~30secs
>> (I assume it's poking about in ~/.mozilla). Everything pops back to 
>> normal afterwards. NFS server is lightly used at the moment.
> 
> 
> Boy... it sure sounds to me like some type of daemon or something is 
> starting up
> that is bring the machine to its knees... . Would it be possible to have 
> a top -i running
> on the server when this pause occurs?
> 
> SteveD.
> 

OK, I've been running "top -d 1 -i" and trying to see what comes up when
the server freezes. I caught one instance where a delay coincided
with about 15 nfsd + 1 kjournald process appearing in the top
display. I'm simultaneously looking at a graphical network tool to try
and see the traffic going to the server - anyone got a better suggestion?

Tomorrow I'll batch top to log to a file and get some users to
note the exact time of any delays (using the ntp-synced clocks) and
see if I can see any correlation.

I'll report back with any findings.

Many thanks

Ian
-- 
Ian Thurlbeck                http://www.stams.strath.ac.uk/
Statistics and Modelling Science, University of Strathclyde
Livingstone Tower, 26 Richmond Street, Glasgow, UK,  G1 1XH
Tel: +44 (0)141 548 3667           Fax: +44 (0)141 552 2079


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