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Device Identification on ADAC Ultra2 S466
Example of ADAC Ultra2 S466 ID Mapping
As Presented to the Operating System
ID
LUN
0
0
0
1
0
2
0
3
0
4
0
5
0
6
0
7
68
ADAC Ultra2 S466 Hardware Guide
All logical drives on each SCSI bus are identified to the
host as ID 0. Differentiate the drives with Logical Unit
Identifiers (LUNs). ID 0 cannot be used for non-disk
devices because they are limited to IDs 1 through 6. The
ADAC Ultra2 S466 is limited to eight logical drives
because LUNs are used to present logical drives. The
SCSI-2 ANSI specification has a limit of eight LUNs per
ID. The SCSI-3 specification increased the number of
LUNs to 16. An example of ID mapping follows.
ID
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Device
Disk (A1-X)
Disk (A2-X)
Disk (A3-X)
Disk (A4-X)
Disk (A5-X)
Disk (A6-X)
Disk (A7-X)
Disk (A8-X)
Channel 1
A1-1
A2-1
CD
A2-5
CD
A4-1
Optical
Reserved
A5-2
A5-6
A6-1
A6-4
A6-7
A7-2
A7-5
A7-8
ID
LUN
1
0
2
0
3
0
4
0
5
0
6
0
Device
Scanner
CD
Tape
CD
Tape
Optical
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