Can't remote mount my 2nd disk - Storage

I recently got a PowerMac with two disks, and I am having touble remote
mounting the second disk onto a Solaris machine.

If I want to look at the "standard" disk I have no problem: I turn off the
firewall, and create an /etc/exports file that contains:
/Users/mylogin -maproot=mylogin IP_solaris_machine
and then do a
mount -F nfs IP_mac_machine /local/mountpoint
and it works fine. BUT, if I try the same thing with my second disk,
by creating an /etc/exports file with
/Volumes/2nddiskname -maproot=mylogin IP_solaris_machine
and then attempt to remote mount it, I always get the error
message that there is "No such file or directory". I've made sure that
the permissions match.
Any ideas?

thanks.