Loop id to al_pa mapping – Chaparral FS2620R User Manual
Page 80
FS2620R Rack Model User’s Guide
A-2
Figure A-1. FS2620R device address mapping
Loop ID to AL_PA Mapping
During the Fibre Channel Arbitrated Loop (FC-AL) initialization process, a unique
Arbitrated Loop Physical Address (AL_PA) value is assigned to each port on the loop.
Not all of the 256 hex values are allowed as AL_PA values per FC-AL, so Loop IDs are
used to represent the 125 addresses that the router can use. You can assign a Loop ID to
the router. See
Configuring the FC Host Channels on page 3-12
.
Host Computer
Fibre Channel
Disk
1
Tape 1
Robot
Channel 0
Channel 1
Channel 2
Disk
2
Disk
3
Disk
4
Disk
5
Disk
6
Disk
7
3456789
15
7
7
Tape 2
Tape 3
Tape 5
Tape 6
Tape 7
Tape 4
5689
0123
FS2620
1
Loop ID
Initiator ID
FC LUN
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Bus:Target:LUN
0:0:0
0:1:0
0:2:0
0:3:0
1:5:0
1:6:0
1:8:0
1:9:0
2:3:0
2:4:0
2:5:0
2:6:0
2:7:0
2:8:0
2:9:0
soft
Device
Robot
Tape1
Tape2
Tape3
Tape4
Tape5
Tape6
Tape7
Disk1
Disk2
Disk3
Disk4
Disk5
Disk6
Disk7
FS2620
maps to
What the Host sees (sd.conf, st.conf)
Loop ID
0
1
2
.
.
.
125
soft
AL_PA
0xEF
0xE8
0xE4
.
.
.
0x01
?
FC Address
0x0000EF
0x0000E8
0x0000E4
.
.
.
0x000001
?
Bus:Target ID
0:0
0:1
0:2
.
.
.
3:29
?
User configured (or
defaulted) @ FS2620
Take first available
(starting at 0xEF)
Mapping depends on
Host HBA and driver
1
Loop ID
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1