[Linux-cluster] Redundant (multipath)/Replicating NFS

[isplist at logicore.net]

I recall that there is a multipath tool for RHEL which allows one to have 
redundant SCSI/FC paths in case one goes away. 

Are there any tools which would accomplish the same with NFS?

Is there any way of replicating NFS data in real time rather than as a regular 
backup, such as RAID1 for example, and be able to fail over to the second path 
or NFS IP should the first fail.

Mike