Hitachi USP V - Port Address Considerations for Fabric Environments; Loop ID Conflicts

2-10 Installing the USP V
Hitachi Universal Storage Platform V/VM Configuration Guide for SGI
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IRIX
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Host Attachment
Port Address Considerations for Fabric Environments
In fabric environments, port addresses are assigned automatically by fabric
switch port number and are not controlled by the USP V port settings. In
arbitrated loop environments, the port addresses are set by entering an AL-PA
(arbitrated-loop physical address, or loop ID).
Table 2-4 shows the available USP V AL-PA values ranging from 01 to EF.
Fibre-channel protocol uses the AL-PAs to communicate on the fibre-channel
link, but the software driver of the platform host adapter translates the AL-PA
value assigned to the USP V port to a SCSI TID. See
Appendix A for a
description of the AL-PA-to-TID translation.
Table 2-4 Available AL-PA Values
EF CD B2 98 72 55 3A 25
E8 CC B1 97 71 54 39 23
E4 CB AE 90 6E 53 36 1F
E2 CA AD 8F 6D 52 35 1E
E1 C9 AC 88 6C 51 34 1D
E0 C7 AB 84 6B 4E 33 1B
DC C6 AA 82 6A 4D 32 18
DA C5 A9 81 69 4C 31 17
D9 C3 A7 80 67 4B 2E 10
D6 BC A6 7C 66 4A 2D 0F
D5 BA A5 7A 65 49 2C 08
D4 B9 A3 79 63 47 2B 04
D3 B6 9F 76 5C 46 2A 02
D2 B5 9E 75 5A 45 29 01
D1 B4 9D 74 59 43 27
CE B3 9B 73 56 3C 26
Loop ID Conflicts
The SGI IRIX operating system assigns port addresses from lowest (01) to
highest (EF). To avoid loop ID conflict, assign the port addresses from highest
to lowest (i.e., starting at EF). The AL-PAs should be unique for each device on
the loop to avoid conflicts. Do not use more than one port address with the
same TID in same loop (e.g., addresses EF and CD both have TID 0, see
Appendix A for the TID-to-AL-PA mapping).