Anyone have a step by step how-to on this?

I've got the NDMPmover daemon running, and a set_ndmp_attr -verify returns
ok...

How do I dedicate 1 drive to be for NDMP type backups? I've tried numberous
methods for this, but keep getting the following in the ndmpmover logs:

19:32:48.756 [05921] +++++++++++++++++ New Connection ++++++++++++++++
19:32:48.756 [05921] Connection Socket 0
19:32:48.757 [05921] Listening for connection...
19:32:48.760 [08283] NdmpMoverAgent state set to IDLE
19:32:48.761 [08283] 5a6c8 <-  (0) 2 [0] 19:32:48 NDMP_CONFIG_GET_HOST_INFO
(0x100) NDMP_NO_ERR (0x0)
19:32:48.762 [08283] ConnectClientAuth: TEXT id="root" password="XXX"
19:32:48.785 [08283] ERROR NdmpTapeUnix::Open() "/dev/rmt/0cbn" mode
NDMP_TAPE_READ_MODE error 5 I/O error
19:32:48.829 [08283] 5a6c8 <-  (0) 5 [0] 19:32:48 NDMP_CONNECT_CLOSE (0x902)
NDMP_NO_ERR (0x0)

TIA,

Darren