nfs cluster problem

[Zhu Sha Zang]

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Hey.

Me again.

I have a small cluster with some scientific apps (gaussian, crystal,
etc). The version installed in the past are ubuntu 7.04, and me, a
smart guy, updated to 7.10, 8.04 and finally 8.10. Are everything is
ok at users start to use the cluster again.

The configuration of cluster is a one server and eleven clientes with
two directories exported via NFS and NIS autentication between they.

The options in /etc/export are:

/home   192.168.1.0/255.255.255.0(rw)
/usr/local/cluster 192.168.1.0/255.255.255.0(ro)

And in /etc/fstab in clientes are:

ladao:/home                     /home                   nfs    
tcp,sync,noatime,nodiratime,rw  0       0
ladao:/usr/local/cluster        /usr/local/cluster      nfs    
tcp,sync,noatime,nodiratime,ro  0       0

But, when i have a existent arch created inside /home directory in
server and try edit this arch in exported /home directory in client
occour a permission error.

Extrange, cos, if i try only create a arch in client, the arch are
created. Thinking that, the permission to write in this directory are
correct.

look:

server:
erik at ladao:~$ ls -lnad .
drwxrwxrwx 9 1000 0 824 2009-04-08 10:30 .

client:
erik at diomedes:~$ ls -lnad .
drwxrwxrwx 9 1000 0 824 2009-04-08 10:30

But, this is the problem:

erik at diomedes:~$ touch teste1
erik at diomedes:~$ echo "aa" >> teste1
erik at diomedes:~$ more teste1
aa
erik at diomedes:~$ echo "a" > teste1
- -bash: teste1: Invalid argument
erik at diomedes:~$ more teste1
erik at diomedes:~$


The archive are recreated, but cleaned.

Then, when the programs, that user are using try to edit and acces the
archies, this programs, don't work correctly.

PLEASE, SOME LIGHT HERE.

ATT.
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