RHEL 5 & NFS Input/Output Error

[Ryan Golhar]

 >This message usually means that NFS server and client do not agree on
 >the version of NFS offered, however this might not be the cause of your
 >problems.

 >So, could you login as root to the RHEL3 boxes and do an:

 >rpcinfo -p server   (server=resolvable name of your RHEL5).

 >and provide the output?

Sure.  Here it is:

    program vers proto   port
     100000    2   tcp    111  portmapper
     100000    2   udp    111  portmapper
     100024    1   udp    662  status
     100024    1   tcp    662  status
     100011    1   udp    875  rquotad
     100011    2   udp    875  rquotad
     100011    1   tcp    875  rquotad
     100011    2   tcp    875  rquotad
     100003    2   udp   2049  nfs
     100003    3   udp   2049  nfs
     100003    4   udp   2049  nfs
     100021    1   udp  32769  nlockmgr
     100021    3   udp  32769  nlockmgr
     100021    4   udp  32769  nlockmgr
     100021    1   tcp  32803  nlockmgr
     100021    3   tcp  32803  nlockmgr
     100021    4   tcp  32803  nlockmgr
     100003    2   tcp   2049  nfs
     100003    3   tcp   2049  nfs
     100003    4   tcp   2049  nfs
     100005    1   udp    892  mountd
     100005    1   tcp    892  mountd
     100005    2   udp    892  mountd
     100005    2   tcp    892  mountd
     100005    3   udp    892  mountd
     100005    3   tcp    892  mountd


 >Also, what are the mount options you use on the /etc/fstab file (or
 >automount config) on the RHEL3 side to mount the home dirs from RHEL5?

On the RHEL 3 side, I have in /etc/fstab:

sapphire:/home          /home          nfs     rw       0 0

 >Do the NFS imported partitions show up in df, does it hang, display the
 >partitions as mounted but with no util info?...

Doing a df shows the partitions.  Everything looks fine:

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda2            151739168  96917132  47114052  68% /
/dev/sda1                46636     34217     10011  78% /boot
none                    509440         0    509440   0% /dev/shm
sapphire:/products    10321216   8222048   1574944  84% /products
scifs:/users         209715200 138025344  67381216  68% /users
scifs:/databases     129653504 103550880  24471296  81% /databases
/dev/ramdisk              7931        13      7918   1% /mnt/ramdisk
sapphire:/home        30472192  21363488   7536192  74% /home

scifs is another machine (SunOS) who isn't affected in anyway.

It definately has something to do with the nfs version being used.  If I 
explicitly change the entry in /etc/fstab to:

sapphire:/home          /home          nfs     rw,vers=2      0 0

the input/output error goes away.  Could it be a patch to nfs in RHEL 5 
changed something to cause this?

Ryan