Re: Strange delays on NFS server

[Jan Bruvoll <jan@bruvoll.com>]

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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