Fibre channel operation, Fibre channel addressing, Names – HP C737990900 User Manual

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20 Interface Implementation

the initiator that least recently connected before processing the command for

the new initiator. See

for more

details.

Fibre Channel Operation

Note

This applies only to Fibre Channel drives.

The following sections have information specific to Fibre Channel operation:

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■

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Fibre Channel Addressing

Before describing HP’s implementation of Fibre Channel addressing, the

concepts of Names and Addresses need to be clarified.

Names

Names are 64-bit identifiers assigned permanently to the tape drive during

manufacture. They are commonly referred to as World Wide Names since they

must be guaranteed unique. The names are typically used for identifying the

device to operating systems, since addresses are assigned dynamically. There

at least eight different name formats distinguished by the Network Address

Authority (NAA). Only one is used on HP Ultrium drives. This is the IEEE

Registered Name (NNA=5) and has the following format:

This name is made up of three fields:

■

NAA Identifier (4 bits). “5” indicates a IEEE Registered Name.

■

IEEE Company ID (24 bits). Assigned by IEEE to the company.

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Vendor Specified ID (36 bits). Assigned by the company.