Weird NFS problem
From: Stuart Bailey (stuart_at_linusoft.co.uk)
Date: 06/21/05
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To: fedora-list@redhat.com Date: Tue, 21 Jun 2005 09:56:07 +0100
I'm having trouble with NFS on a Fedora 3 server. The client machines are a
mixture of HP Unix and Solaris (also samba is used for Windows clients).
Most of the time the NFS export point runs perfectly fine, a client have it
mounted all the time, and files and directories can be listed as expected.
All users have write access.
However, occasionally (about once a day) the files in various directories
disappear from the client machines. If I go to the server and cd to the
troublesome directories, they immediately become available to the clients
again. As a quick fix, I have created a cron job that runs ls -R for the root
directory of the nfs export.
The only error I get in the logs is:
Jun 13 07:39:58 kelvin rpc.statd[2248]: Received erroneous SM_UNMON request
from kelvin.test for 172.16.44.23
but this indicates a write access problem with /var/lib/nfs/statd/sm and sm.d.
But I have checked that the rpc users has r/w access to these.
I tried a tcpdump and got the following:
13:27:36.751186 IP (tos 0x0, ttl 64, id 52539, offset 0, flags [DF], proto 6,
length: 148) tescat2.680050 > kelvin.test.nfs:108 lookup [|nfs]
13:27:36.751223 IP (tos 0x0, ttl 64, id 14271, offset 0, flags [DF], proto 6,
length: 160) kelvin.test.nfs > tescat2.680050:reply ok 120 lookup ERROR: No
such file or directory post dattr:
13:27:36.751646 IP (tos 0x0, ttl 64, id 52540, offset 0, flags [DF], proto 6,
length: 132) tescat2.680051 > kelvin.test.nfs:92 getattr [|nfs]
Based on this I have tried turning off client side attribute caching, to no
effect.
I have exported the directories as such:
/data 172.16.44.0/24 (rw,async,insecure,insecure_locks,no_subtree_check)
I have also tried sync instead of async, and removing the no_subtree_check
flag, also to no effect.
Other things I have tried:
reducing the MTU on the network to 1000 from 1500
Any ideas would be appreciated.
Many thanks,
Stuart.
--
---------------------------------------
Stuart Bailey BSc (hons) CEng CITP MBCS
LinuSoft (Proprietor)
Linux Specialist
(01953) 601294
(07778) 383739
http://www.linusoft.co.uk
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