Re: Problems with RHEL 5 server: NFS related?

The NFS version running is 3. I've noticed that "kernel: svc: unknown
version (3)" messages are appearing in /var/log/messages, but I have no
indication that the NFS-share is not working properly. And again, I don't
understand why an NFS export could cause this kind of symptom.

On 2/2/09, kim.desmaele@xxxxxxxxxxxxxxxxxxxx <
kim.desmaele@xxxxxxxxxxxxxxxxxxxx> wrote:

Hi all,

- I experienced the same issue... I think it has something to do with
filesystem antributes.
To avoid this kind of situations on Solaris, a share option "anon=0" is
defined on the solaris nfs server.

<snip \\ solaris nfs share manpage>

anon=uid
Set uid to be the effective user ID of
unknown users. By default, unknown users
are given the effective user ID UID_NOBODY.
If uid is set to -1, access is denied.
</snip>

- Are you using nfs version 3 or 4 ?
- try a tcpdump and filter out all the sent and received from an to the
nfs server/client.
- Verify if you don't have any other security limitations on your nfs
share defined.

If any one knows the share option which needs to be defined in
/etc/exports, I'll be glad to hear it! ;-)

Hope this helps!

grts,

Kim




Did you check if the filesystem(s) were mounted RW?

Note that you can't always trust the output of mount.

We ran into a kernel bug on some of our virtual servers a while ago
where a file system became read-only in the event of busy I/O retry or
path failover of the ESX Server's SAN storage (details available at
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd
=displayKC&externalId=51306)

Even though mount showed the file system mounted rw the file system was
in fact write-protected as trying to remount it showed:
# mount -o remount,rw /
mount: block device /dev/rootvg/rootlv is write-protected, mounting
read-only

Considering 2 of your symptoms indicate a problem with the file system
you might want to investigate in this direction.

HTH

Bram

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