Re: NFS regression? Odd delays and lockups accessing an NFS export.

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Ian Campbell wrote:
(added some quoting from previous mail to save replying twice)

On Sun, 2008-08-24 at 15:19 -0400, Trond Myklebust wrote:
On Sun, 2008-08-24 at 15:17 -0400, Trond Myklebust wrote:
>From the tcpdump, it looks as if the NFS server is failing to close the
socket, when the client closes its side. You therefore end up getting
stuck in the FIN_WAIT2 state (as netstat clearly shows above).

Is the server keeping the client in this state for a very long
period?

Well, it had been around an hour and a half on this occasion. Next time
it happens I can wait longer but I'm pretty sure I've come back from
time away and it's been wedged for at least a day. How long would you
expect it to remain in this state for?

BTW: the RPC client is closing the socket because it detected no NFS
activity for 5 minutes. Did you expect any NFS activity during this
time?

It's a mythtv box so at times where no one is watching anything and
there isn't anything to record I expect NFS activity is pretty minimal.

Ian.


Ian,

Do you have a recording group setup on the NFS partition that mythtv is
going to be accessing?

I have seen similar funny stuff happen, it used to happened around 2.6.22*
(on each end), and quit happening around 2.6.24* and now has started happening
again with 2.6.25* on both ends.

Similar to what you have the only thing I see is "NFS server not responding" and restarting the NFS server end (/etc/init.d/nfs restart) appears to get things to continue on the NFS client. No other messages appear on either end that indicate that anything is wrong, other non-nfs partitions on the client work find, the machine is still up, and the NFS server is still up and fine, and after a restart things will again work for a while (hours or days).

                            Roger
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