Options available for nfs debugging RHEL 5.3

[mahima kaushik]

Hi,

Having trouble with nfs mounts on red hat system.  NFS server is a MAC OSX
server and it mounts fine for solaris clients.  Problem is only with red hat
clients.
It is not allowing anyone to vi or cp on files that are owned by groups that
users are part of.  commands like mv or :wq! works fine.
for example:
# df -k
nfsserver:/dir    /localdir
# cd /localdir
# ls -la
rwxrwxr-x   user1 group1  file.txt
# id
user3  (group1)
# echo hi > file.txt
file exists
# echo hi >> file.txt     (works fine)

rpc_debug and nfs_debug are not generating enough output for me to
troubleshoot it correctly.
Any help is appreciated!
mk
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