IBM System Storage TS3310 - Default Loop Ids and Their Associated

Fibre Channel topology. The table below lists the default Loop IDs and AL_PAs for
each drive in the library.
Table 2-2. Default Loop IDs and their associated AL_PAs for Ultrium Tape Drives in the
library
Module
Drive
Position
Drive Location
Coordinate Default Loop ID Default AL_PA
Control
Module
1 0, 1 0 X’EF’
2 0, 2 1 X’E8’
9U Expansion
Module
3 -1, 1 2 X’E4’
4 -1, 2 3 X’E2’
5 -1, 3 4 X’E1’
6 -1, 4 5 X’E0’
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.
Table 2-3. Valid Loop IDs and their associated AL_PAs for Ultrium Tape Drives in the library
7-bit Loop ID
(decimal)
8-bit AL_PA
(hexadecimal)
7-bit Loop ID
(decimal)
8-bit AL_PA
(hexadecimal)
7-bit Loop ID
(decimal)
8-bit AL_PA
(hexadecimal)
0 X’EF’ 43 X’A3’ 86 X’4D’
1 X’E8’ 44 X’9F’ 87 X’4C’
2 X’E4’ 45 X’9E’ 88 X’4B’
3 X’E2’ 46 X’9D’ 89 X’4A’
4 X’E1’ 47 X’9B’ 90 X’49’
5 X’E0’ 48 X’98’ 91 X’47’
6 X’DC’ 49 X’97’ 92 X’46’
7 X’DA’ 50 X’90’ 93 X’45’
8 X’D9’ 51 X’8F’ 94 X’43’
9 X’D6’ 52 X’88’ 95 X’3C’
10 X’D5’ 53 X’84’ 96 X’3A’
11 X’D4’ 54 X’82’ 97 X’39’
12 X’D3’ 55 X’81’ 98 X’36’
13 X’D2’ 56 X’80’ 99 X’35’
Chapter 2. Installation Planning 2-5