[NTLUG:Discuss] NFSv4 and referrals

[Richard]

Can someone direct me to documentation or tutorial webpage to help me 
understand how to setup NFSv4 referral shares?

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I've been asked to setup multiple NFS connections between several sets 
of servers.  Someone mentioned that setting up an NFSv4 referral server 
would be make the solution more convenient so I set out to look at what 
it would take to use NFS v4.

The servers that export the NFS shares are Solaris boxes and the servers 
that will be connecting to the shares are running Centos 5.5.

My first good hit for an explanation of NFS referrals and how it works 
came from a Nexenta product PDF ( 
http://www.nexenta.com/corp/static/docs-stable/Namespace-Cluster-User-Guide.pdf 
).   The diagram in the OVERVIEW section seems simple enough with the 
only difference I see being that I want to use a Centos5.5 server as the 
'headnode'.

Google hits for 'NFS headnode' show the term 'head node' is used by 
Beowolf clusters.   Narrowing the search to 'centos nfsv4 headnode' 
returns 
http://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-nfs.html as 
the first hit.  That hit does explain NFSv4 but I'm looking specifically 
at example setting up referral links.  Adding referral to the previous 
Google search takes me right back to the Nexenta hit.  I don't know what 
you call an NFS server that redirects NFS requests to other servers but 
headnode sounds good to me.

I've tried adding other various terms such as: example nfs4 server setup 
referral  ...
but with  no more luck.   I did find ( 
http://blog.laimbock.com/2009/05/21/nfsv4-on-centos-53-and-fedora-11/ ) 
which seemed helpful but is still not a clear enough picture to explain 
to my thick skull how to configure the exports file to REFER a share to 
another server.