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Fibre Channel Attachment
Attention: A Class I laser assembly, in the optical transceiver, is
mounted on the Ultrium Fibre Channel electronics card. This laser
assembly is registered with the Department of Health and Human
Services and is in compliance with IEC825.
To communicate with a server, the Ultrium 2 Tape Drive has one Fibre Channel
interface (also called a port). In accordance with the standards of the American
National Standards Institute (ANSI), the port runs Fibre Channel Protocol (which
includes SCSI commands on the Fibre Channel) with ANSI-defined Fibre Channel
Tape Support. The method by which the drive and server communicate is
determined by the type of topology in which they reside and the type of connection
that you choose.
Supported Topologies
The Ultrium 2 Tape Drive can be attached in a two-node configuration, either
directly to a switch as a public device (switched fabric) or directly to a host bus
adapter (HBA) as a private device. It can do so in a Point-to-Point topology (through
an N_port or F_port) or Arbitrated Loop topology (through an L_port or FL_port).
Unless you set the drive to force an explicit configuration (by using the FC
configuration/status connector; see “Step 4. Change the Link Services of the Drive
(optional)” on page 24), the Ultrium 2 Tape Drive automatically configures to an
L_port or an N_port when it boots. The type of port to which it configures depends
on whether the drive recognizes the connection as a loop or a point-to-point
connection:
v An L_port supports a Fibre Channel Arbitrated Loop connection to an NL_port or
FL_port.
v An N_port supports direct connection to another N_port or to an F_port (for
example, a director-class switch) in a point-to-point topology.
Regardless of the port to which you connect the drive, it automatically configures to
a public device (through an F_port or FL_port to a switch) or to a private device
(through an N_port or L_port by using direct attachment to a server).
Table 3 lists the topologies in which the Ultrium 2 Tape Drive can operate, the Fibre
Channel server connections that are available, and the port (NL, N, FL, or F)
through which communication must occur.
Table 3. Choosing the port for your topology and Fibre Channel connection
Type of Topology
Type of Fibre Channel Connection to Server
Direct Connection
(Private)
Switched Fabric
(Public)
Fibre Channel-Arbitrated
Loop
(can be Two-Node Arbitrated
Loop or Two-Node Switched
Fabric Loop; is limited to two
nodes)
L_Port FL_Port
Point-to-Point
(two nodes)
N_Port F_Port
6 IBM TotalStorage LTO Ultrium 2 Tape Drive