Problems with RHEL 5 server: NFS related?

[Kenneth Holter]

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 at bayercropscience.com <
kim.desmaele at bayercropscience.com> 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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