nfs woes in FreeBSD 6.0

[Danny Butroyd]

Hi List

I have major problems using NFS on FreeBSD.  My setup is:-

1 mail server with 6.0 running NFS to serve mailboxes in standard unix
format
2 webmail servers running a customised squirrellmail mounting the
mailboxes from the main server
(Yes, i know this is a nasty setup).

All servers are talking over gigabit ethernet with an MTU set to 9000, 
they are all running Intel gigabit cards.

Basically the mail server was running 5.1 and was working fine.  I
upgraded to 6.0 and now the NFS screws up all the time.  The symtoms are
failing NFS connections and corrupted mailboxes.

Server errors are:-
Feb 27 08:43:11 cwsmail-pri kernel: nfsd send error 32
Feb 27 08:56:47 cwsmail-pri kernel: nfsd send error 32
Feb 27 09:00:33 cwsmail-pri kernel: nfsd send error 32
Feb 27 09:12:21 cwsmail-pri kernel: nfsd send error 32
Feb 27 09:15:48 cwsmail-pri kernel: nfsd send error 32
Feb 27 09:24:11 cwsmail-pri last message repeated 11 times
Feb 27 09:28:57 cwsmail-pri last message repeated 9 times


Client errors are:-
Feb 27 09:29:27 cwswebmail-1 kernel: nfs send error 35 for server
172.31.255.100:/var
Feb 27 09:29:33 cwswebmail-1 kernel: nfs send error 35 for server
172.31.255.100:/var
Feb 27 09:29:34 cwswebmail-1 kernel: nfs server 172.31.255.100:/var: not
responding
Feb 27 09:29:37 cwswebmail-1 kernel: nfs server 172.31.255.100:/var: not
responding
Feb 27 09:29:38 cwswebmail-1 kernel: nfs send error 35 for server
172.31.255.100:/var
Feb 27 09:29:40 cwswebmail-1 kernel: nfs server 172.31.255.100:/var: not
responding
Feb 27 09:29:43 cwswebmail-1 kernel: nfs server 172.31.255.100:/var: not
responding
Feb 27 09:29:43 cwswebmail-1 kernel: nfs send error 35 for server
172.31.255.100:/var
Feb 27 09:29:48 cwswebmail-1 kernel: nfs send error 35 for server
172.31.255.100:/var
Feb 27 09:29:51 cwswebmail-1 kernel: nfs server 172.31.255.100:/var: not
responding
Feb 27 09:29:53 cwswebmail-1 kernel: nfs send error 35 for server
172.31.255.100:/var
Feb 27 09:29:53 cwswebmail-1 kernel: nfs server 172.31.255.100:/var: is
alive again


Any help will be very much appreciated.

Thanks
Danny