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101

SCSI Command Overview

Drive Control Commands

Chapter 1 1-15

SCSI Command OverviewSCSI Command Overview

Busy 08H

A busy status is returned by the target during powerup until all poweron

diagnostic tests have been completed. A busy status is also returned

when multiple commands are outstanding in the target, and a media

access command is received with the DISC PRIV bit cleared in the

identify message.

Intermediate/Good 10H

Unless an error, exception, or abnormal condition causes a Check

Condition status or a Reservation Conflict status, the Intermediate Good

status is returned for every command in a series of linked commands,

excluding the last command. If this status is not returned, the chain of

linked commands is broken; no further commands in the series are

executed.

Intermediate Condition Met 14H

This status is the combination of the Condition Met and the

Intermediate statuses.

Reservation Conflict 18H

This status is returned when a SCSI device attempts to access a logical

unit that is reserved for another initiator.

Queue Full 28H

This status is returned when a Simple Queue Tag, Ordered Queue Tag,

or a Head of Queue Tag message is received and the command queue of

the drive is full. The I/O process is not placed in the command queue. The

drive can handle 32 I/O processes at a time.

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