Fibre Channel Drive Ids; Default Loop Ids And Their Associated - IBM System Storage TS3310 Setup And Operator Manual

Fibre Channel Drive IDs

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Table 2-3. Valid Loop IDs and their associated AL_PAs for Ultrium Tape Drives in the library
7-bit Loop ID
(decimal) (hexadecimal)
0
1
2
3
4
5
6
7
8
Each Fibre Channel Ultrium Tape Drive in the library must have a Loop ID and
corresponding Arbitrated Loop Physical Address (AL_PA) to communicate in a
Fibre Channel topology. The table below lists the default Loop IDs and AL_PAs for
each library configuration.
**NOTE TO REVIEWERS: What are the Default Loop IDs for multi-module
libraries, or how does the user find them out?**
Table 2-2. Default Loop IDs and their associated AL_PAs for Ultrium Tape Drives in a 14U
library
Drive
Module
Position
Control 1
Module
2
9U Expansion 3
Module
4
5
6
Note: Loop IDs are given in decimal format and AL_PA values are given in hexadecimal
format.
You can change a Loop ID by using the library's operator panel or Web User
Interface. Using a method called hard addressing, the drive then automatically
selects the corresponding AL_PA, which is the identifier that devices use to
communicate. Valid Loop ID values range between 0 and 125. The higher the
number of the Loop ID (and AL_PA), the lower the priority of the device in the
loop.
You can also specify Loop IDs that allow the drive to dynamically arbitrate the
AL_PA with other Fibre Channel devices on the loop. This method avoids conflicts
over the address and is called soft addressing. To dynamically arbitrate the AL_PA,
specify a Loop ID of 126 or 127.
For a complete list of Loop IDs and their corresponding AL_PAs, see the table
below.
8-bit AL_PA 7-bit Loop ID
(decimal)
X'EF' 43
X'E8' 44
X'E4' 45
X'E2' 46
X'E1' 47
X'E0' 48
X'DC' 49
X'DA' 50
X'D9' 51
Drive Location
Coordinate Default Loop ID
0, 1
0, 2
-1, 1
-1, 2
-1, 3
-1, 4
8-bit AL_PA 7-bit Loop ID
(hexadecimal) (decimal)
X'A3'
X'9F'
X'9E'
X'9D'
X'9B'
X'98'
X'97'
X'90'
X'8F'
Chapter 2. Installation Planning
Default AL_PA
0 X'EF'
1 X'E8'
2 X'E4'
3 X'E2'
4 X'E1'
5 X'E0'
8-bit AL_PA
(hexadecimal)
86 X'4D'
87 X'4C'
88 X'4B'
89 X'4A'
90 X'49'
91 X'47'
92 X'46'
93 X'45'
94 X'43'
2-5