Raid over NFS

[aymeric.muntz at free.fr]

hi list!

I am actually seachring a solution for doing raid over NFS.
My need is to have 2 mail servers sharing the same storage.
For redundancy reason, I would like to have a duplicate partition (one on each
server accessible by NFS) and do a software RAID (mirroring) on the other.

Is there a well known and stable solution?
It looks like vinum is not able to do that.

I appreciate any return.

Thanks

Aymeric