automatically occupies TID 7 on each SCSI channel. Eight-bit SCSI devices can only use the TIDs from 0 to 6. 16-bit devices can use the TIDs from 0 to 15. The arbitration priority for a SCSI device depends on its TID. Table 6.7 shows the relative priority of each Target ID:
Table 6.7 Priority of Target IDs
Priority | Highest | | | Lowest | |
| | | | | | |
TID | 7 | 6 | 5 ... 2 | 1 | 0 15 14 ... 9 | 8 |
| | | | | | |
Important: Non-disk devices (CD-ROM or tape drive) should have unique SCSI IDs regardless of the channel they are connected to. ID 0 cannot be used for non-disk devices because they are limited to IDs 1 through 6. There is a limit of six IDs per controller for non-disk devices.
6.2.10.1Example of MegaRAID SCSI 320-2 ID Mapping
Table 6.8 provides an example of ID mapping for the SCSI 320-2.
Table 6.8 | Example of Mapping for SCSI 320-2 |
| | | | |
ID | | Channel 0 | Channel 1 | |
| | | | |
0 | | A1-1 | A1-2 | |
| | | | |
1 | | A2-1 | CD | |
| | | | |
2 | | CD | A2-3 | |
| | | | |
3 | | A2-5 | A2-6 | |
| | | | |
4 | | CD | A3-1 | |
| | | | |
5 | | A4-1 | Tape | |
| | | | |
6 | | Optical | A5-1 | |
| | | | |
7 | | Reserved | Reserved | |
| | | | |
8 | | A5-2 | A5-3 | |
| | | | |
9 | | A5-6 | A5-7 | |
| | | | |
10 | | A6-1 | A6-2 | |
| | | | |
11 | | A6-4 | A6-5 | |
| | | |
Installation Steps | 6-19 |
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
