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World Wide Names
Each Ultrium 2 Tape Drive has an 8-byte World Wide Node Name and an 8-byte
World Wide Port Name that is assigned by IBM Manufacturing. The World Wide
Node Name identifies the drive’s SCSI logical unit; the World Wide Port Name
identifies the physical port on the drive. An enclosure queries the World Wide
Names through the LDI or RS-422 interface; a server queries the Names through
the Fibre Channel interface. The Ultrium 2 Tape Drive reports the World Wide
Names to switches. You can use the World Wide Node Name or Wide Node Port
Name to uniquely identify the drive on a SAN.
When your Ultrium 2 Tape Drive is installed in a tape library, you can change the
World Wide Node Name and World Wide Port Name through the LDI or RS-422
interface. For instructions, refer to the documentation for your tape library.
Physical Characteristics of the Fibre Channel Interface
The Ultrium 2 Tape Drive attaches to Open Systems servers by using short-wave,
multimode fiber optic cables. All cables feature LC-duplex connectors and are
designated as 50/125 (50 refers to the diameter of the optical fiber and 125 refers
to the diameter of the cable; both are measured in micrometers).
For a list of available cables, see Appendix A, “Tools and Supplies” on page 95.
Installing, Removing, or Resetting a Drive on an Active Fibre Channel
A Fibre Channel network supports dynamic drive attachment. When adding,
removing, or resetting a drive on an active server or SAN, perform the following
steps:
1. Quiesce the drive. The drive to be added, removed, or reset must not be
involved in activity.
2. Connect or disconnect the Fibre Channel cables to or from the drive.
8 IBM TotalStorage LTO Ultrium 2 Tape Drive