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101

SCSI Command Overview

Drive Control Commands

Chapter 1 1-13

SCSI Command OverviewSCSI Command Overview

The Head of Queue Tag message specifies that the I/O process be placed

first in the logical unit's command queue. When the drive receives a

subsequent I/O process received with a Head of Queue Tag message, the

I/O process that has been already done is not interrupted.

The Ordered Queue Tag message specifies that the I/O process be placed

in the logical unit's command queue for execution in the order received.

All queued I/O processes for the logical unit received prior to this I/O

process are executed before this I/O process is executed. All queued I/O

processes received after this I/O process are executed after this I/O

process, except for I/O processes received with a Head of Queue Tag

message.

Identify 80H-FFH

These messages are sent by either the initiator or the target to establish

the physical path connection between initiator and target for a particular

logical unit.

Bit 7 This bit is always set to 1.

Bit 6 This bit is set to 1 by the initiator to indicate that the

initiator has the ability to accommodate the disconnec-

tion and reconnection.

Bit 5-3 Reserved.

Table 1-6 Head of Queue Tag

Byte 7 6 5 4 3 2 1 0

0 Message Code (21H)

1 Queue Tag (00H-FFH)

Table 1-7 Ordered Queue Tag

Byte 7 6 5 4 3 2 1 0

0 Message Code (22H)

1 Queue Tag (00H-FFH)

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 377 378

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