From: Jan Bruvoll <jan@bruvoll.com>
Subject: Re: Strange delays on NFS server
Date: Tue, 24 Aug 2004 11:27:02 +0100
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Message-ID: <412B17F6.3030700@bruvoll.com>
References: <411A17F2.2060203@RedHat.com> <411A448D.3080205@stams.strath.ac.uk> <20040811164135.GA11101@suse.de> <411B8987.1030609@stams.strath.ac.uk> <411CD601.1080308@RedHat.com> <4120AB46.1080606@stams.strath.ac.uk> <20040816131434.GL3510@suse.de> <4120C8D5.3040606@stams.strath.ac.uk> <20040816145435.GQ3510@suse.de> <4124CD95.7020007@stams.strath.ac.uk> <20040820095854.GC23176@suse.de> <412B0EDE.5010206@stams.strath.ac.uk>
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Cc: Olaf Kirch <okir@suse.de>,  nfs@lists.sourceforge.net
To: Ian Thurlbeck <ian@stams.strath.ac.uk>
In-Reply-To: <412B0EDE.5010206@stams.strath.ac.uk>
Errors-To: nfs-admin@lists.sourceforge.net

Dear all,

Ian Thurlbeck wrote:

> I have tested the patched kernel - it is no different. In fact
> I'd say it's slightly worse.  I've been running "atop" to monitor
> net/disk io and during an "event" I see that the main 3ware raid
> array is writing at 100% (60MB/sec+) for up to 50 seconds.  There
> is little network traffic. During this period client machines are
> unusable if they are requesting stuff off the server.


I haven't had the opportunity to test things this thoroughly yet, but I 
see the same symptoms on our server here - when the "hick-up" comes, the 
server, if under heavy fire, will be completely unresponsive for as long 
as it is trying to get out of the mess. After a little while, things 
will clear up again (I guess that could have to do with clients just 
giving up on things), just to clog up about a minute later.

And as Ian mentions, the clients will be stuck for as long as this goes on.

Thanks very much for your continued efforts - if there is anything I 
could do to help debug this issue or otherwise contribute to the fixing 
of this problem, I'd happily oblige!

Best regards
Jan


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