Port Address Considerations For Fabric Environments; Loop Id Conflicts - Hitachi Universal Storage Platform V Configuration Manual

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
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
description of the AL-PA-to-TID translation.
Table 2-4
EF CD
E8 CC
E4 CB
E2 CA
E1 C9
E0 C7
DC C6
DA C5
D9 C3
D6 BC
D5 BA
D4 B9
D3 B6
D2 B5
D1 B4
CE B3

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
2-10
Hitachi Universal Storage Platform V/VM Configuration Guide for SGI
shows the available USP V AL-PA values ranging from 01 to EF.
Available AL-PA Values
B2 98 72 55
B1 97 71 54
AE 90 6E 53
AD 8F 6D 52
AC 88 6C 51
AB 84 6B 4E
AA 82 6A 4D
A9 81 69 4C
A7 80 67 4B
A6 7C 66 4A
A5 7A 65 49
A3 79 63 47
9F 76 5C 46
9E 75 5A 45
9D 74 59 43
9B 73 56 3C
for the TID-to-AL-PA mapping).
Installing the USP V
3A 25
39 23
36 1F
35 1E
34 1D
33 1B
32 18
31 17
2E 10
2D 0F
2C 08
2B 04
2A 02
29 01
27
26
Appendix A for a
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IRIX Host Attachment