I believe this is the same problem I've had pertaining to NFS plus ZFS plus ZFS/NFS exports and mounts.
Did this problem first show up after a reboot? If so, try "zfs share <zfspool>/<zfs dir>" to have your mounts recreated. For example "zfs share zfsdata/home" and then check if all of your other ZFS/NFS exports are now mounted. HTH. Wes W. This message posted from opensolaris.org
