When installing a wide SCSI controller in a computer, which ID number should be configured on the controller to give it the highest priority in the chain?

The correct answer is B. 7. In SCSI bus arbitration, devices with higher SCSI IDs have higher bus priority - with ID 7 being the highest priority on both narrow (8-device, IDs 0–7) and wide SCSI (16-device, IDs 0–15) buses. The priority order for wide SCSI places ID 7 at the top, followed by 6, 5, 4, 3…

Hardware

Question

When installing a wide SCSI controller in a computer, which ID number should be configured on the controller to give it the highest priority in the chain?

Options

How the community answered

(37 responses)

A
5% (2)
B
89% (33)
C
3% (1)
D
3% (1)

Explanation

In SCSI bus arbitration, devices with higher SCSI IDs have higher bus priority - with ID 7 being the highest priority on both narrow (8-device, IDs 0–7) and wide SCSI (16-device, IDs 0–15) buses. The priority order for wide SCSI places ID 7 at the top, followed by 6, 5, 4, 3, 2, 1, 0, then 15, 14, 13, 12, 11, 10, 9, 8. By convention, the SCSI host adapter/controller is assigned ID 7 so it always wins bus arbitration and can manage the chain efficiently. Assigning ID 7 to the controller is a standard SCSI configuration rule.

Topics

#SCSI#SCSI ID#device priority#controller configuration

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