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ADAC Ultra2 S466 Hardware Guide

Device Identification on ADAC Ultra2 S466

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.

Example of ADAC Ultra2 S466 ID Mapping

ID Channel 1

0A1-1

1A2-1

2CD

3A2-5

4CD

5A4-1

6 Optical

7 Reserved

8A5-2

9A5-6

10 A6-1

11 A6-4

12 A6-7

13 A7-2

14 A7-5

15 A7-8

As Presented to the Operating System

ID LUN Device ID LUN Device

0 0 Disk (A1-X) 1 0 Scanner

0 1 Disk (A2-X) 2 0 CD

0 2 Disk (A3-X) 3 0 Tape

0 3 Disk (A4-X) 4 0 CD

0 4 Disk (A5-X) 5 0 Tape

0 5 Disk (A6-X) 6 0 Optical

0 6 Disk (A7-X)

0 7 Disk (A8-X)

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 111 112

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