On 05/16/11 13:33, Trond Myklebust wrote:
On Mon, 2011-05-16 at 16:21 -0400, Chuck Lever wrote:
On May 16, 2011, at 3:43 PM, Trond Myklebust wrote:
On Mon, 2011-05-16 at 12:36 -0700, Harry Edmon wrote:
On 05/16/11 12:22, Chuck Lever wrote:
On May 16, 2011, at 3:12 PM, Harry Edmon wrote:
Attached is 1000 lines of output from tshark when the problem is occurring. The client and server are connected by a private ethernet.
Disappointing: tshark is not telling us the return codes. However, I see "PUTFH;READ" then "RENEW" in a loop, which indicates the state manager thread is being kicked off because of ongoing difficulties with state recovery. Is there a stuck application on that client?
Try again with "tshark -V".
Here is the output from tshark -V (first 50,000 lines). Nothing
appears to be stuck, and as I said when I reboot the client into 2.6.32
the problem goes away, only to reappear when I reboot it back into 2.6.38.6.
Possibly, but it definitely indicates a server bug. What kind of server
are you using?
Basically, the client is getting confused because when it sends a READ,
the server is telling it that the lease has expired, then when it sends
a RENEW, the same server replies that the lease is OK...
I've seen this during migration recovery testing. The client may be testing the wrong client ID.
But I wonder if it's really worth doing that separate RENEW. I've seen the client send a RENEW after it gets STALE_STATEID. Would RENEW really tell the client anything in that case?
It is needed.
Without the RENEW, we have no idea whether or not we need to do a full
state recovery. Running a full recovery when we don't have to is _bad_,
and will usually cause us to lose delegations and may possibly even
cause us to lose locks.
By the way, this is not the only client/server running 2.6.38 that I
have this problem on. It is occurring on other random ones I
maintain. This example is happens to be the cleanest one I have, this
NFS server is only talking to this specific NFS client over a private
network.
--
Dr. Harry Edmon E-MAIL: harry@xxxxxx
206-543-0547 FAX: 206-543-0308 harry@xxxxxxxxxxxxxxxxxxxx
Director of IT, College of the Environment and
Director of Computing, Dept of Atmospheric Sciences
University of Washington, Box 351640, Seattle, WA 98195-1640
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