Well, what is wrong with this method? You simply edit /etc/exports (there is a vers=-part in the line which states the NFS version), issue a exportfs -va and you are done. You can even configure every export for several versions of NFS at the same time, so you can transform NFSv3-shares to NFSv3+NFSv4 and in a second step change from NFSv3+NFSv4 to NFSv4 only.

A few caveats, though:

- There are different daemons involved in NFSv3 and NFSv4. Issue an

Code:

lssrc -g nfs

to see if they are indeed all running. For NFSv4 you need nfsd and nfsrgyd, for NFSv3 you need nfsd, biod, rpc.statd, rpc.lockd and rpc.mountd running. For NFSv3 you may also need the portmapper.

- For "scattered" NFSv4 exports you need some static storage: NFSv4 allows for transient filelocks: if you open a file from serverA and this server dies but its exports are also exported via serverB you can resume your work with the same file from serverB while maintaining file- and record-locks. For this you need some static storage where NFS stores these locks.

- NFSv4 uses "NFS-domains" and for a client to mount an export it has to have the same NFS domain configured. Use the command chnfsdomain to display/change the value. My suggestion is to use the same value as the DNS domain because this is rather easy to maintain. Otherwise the name of the domain doesn't matter at all.

I hope this helps.

bakunin