Status/Error Reporting | Quantum Instruments DLT 7000 manual

SCSI Commands

Bit

Byte

Vendor Specific

Reserved

Flag

Link

Figure 5–2 Command Descriptor Block Control Field - Data Format

Table 5–3 Command Descriptor Block Control Field - Field Descriptions

Field	Description

Vendor Specific Bits	These bits must be 0.
Flag Bit	The Flag bit is used in conjunction with the Link bit to notify the initiator in
	an expedient manner that a command has been completed.
Link Bit	A Link bit set to 1 indicates that the initiator requests continuation of a task
	(an I/O process) across two or more SCSI commands.
	If the Link bit is 1 and the Flag bit is 0, and the task completes successfully,
	the drive continues the task and returns a status of INTERMEDIATE and a
	LINKED COMMAND COMPLETE message.
	If the Link bit and the Flag bit within a Control word are both set to 1, and
	the drive completes a command with a status of INTERMEDIATE, the drive
	returns a LINKED COMMAND COMPLETE message (with Flag).

5.1.3 Status/Error Reporting

SCSI message-level errors are communicated by messages that are defined specifically for that purpose (for example, MESSAGE PARITY ERROR, MESSAGE REJECT). Message-level errors are also handled by drive-managed retries. Refer to Chapter 4 for more detailed message-handling information.

SCSI command-level errors are communicated by a status code that is returned by the drive during the STATUS phase. This phase occurs at the end of each command, unless the command is terminated by one of the following events:

∙ABORT message

∙BUS DEVICE RESET message

∙Hard reset condition

∙Unexpected disconnect

5-6	Quantum DLT 7000 Tape System

DLT 7000 specifications

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Quantum Instruments DLT 7000 manual Status/Error Reporting

Models: DLT 7000