you can have only 1 logical file server. so you can do something like:
-create an alias like blfs.foo.com that resolves to your file server (dns or hosts file).
-configure this alias as the file server
-using a file deploy job, rsync, etc replicate the file server contents from the active to passive node.
-if the active fails bring up the passive.
now, there are other things you could do involving nfs, load balancers, 3dns, etc but above is the basic.
Thanks. This is what I thought I had read but was unable to find it stated anywhere explicitly.