When the system boots, the NFS server is not enabled unless there are NFS exports listed in /etc/dfs/dfstab.
To start the nfs server after adding an entry to dfstab, issue the following command:
# /etc/init.d/nfs.server start
Note that it isn't currently possible to start the nfs server using the "nfs.server" script unless there are entries in /etc/dfs/dfstab.
If you want to do automatic sharing of CDs through vold, you need to export at least one other filesystem if you're running Solaris 2.6 or earlier.