Messages

4.2.7 INITIATOR DETECTED ERROR Message (05h)

The INITIATOR DETECTED ERROR message is sent from an initiator to inform the drive that an error has occurred that does not preclude the drive from retrying the operation (a bus parity error, for example). The source of the error may either be related to previous activities on the SCSI bus or may be only drive- related. When received, the tape drive attempts to re-transfer the last command, data, or status bytes by using the RESTORE POINTER message mechanism.

The drive’s response to and its handling of an INITIATOR DETECTED ERROR message are based on when, in the I/O process, the initiator introduces the message. Table 4–7 summarizes the drive’s response.

Table 4–7 Drive Response to INITIATOR DETECTED ERROR Message

BUS Phase

Drive Response

 

 

SELECTION

The drive discards the INITIATOR DETECTED ERROR message and then

 

goes to the BUS FREE phase.

COMMAND

The drive discards any Command Descriptor Block bytes fetched from

 

the initiator, sets the Sense Key to ABORTED COMMAND, sets the

 

Additional Sense Code to INITIATOR DETECTED ERROR MESSAGE

 

RECEIVED. It sends the CHECK CONDITION status and the COMMAND

 

COMPLETE message and then goes to the BUS FREE phase.

DATA

The drive discards the INITIATOR DETECTED ERROR message and sets the

 

Sense Key to ABORTED COMMAND, sets the Additional Sense Code to

 

INITIATOR DETECTED ERROR MESSAGE RECEIVED. It sends the CHECK

 

CONDITION status and the COMMAND COMPLETE message and then

 

goes to the BUS FREE phase.

STATUS

The drive sends a RESTORE POINTERS message, returns to the STATUS

 

phase, resends the STATUS command, and continues the I/O process.

MESSAGE IN

The drive discards the INITIATOR DETECTED ERROR message and sets the

 

Sense Key to ABORTED COMMAND, sets the Additional Sense Code to

 

INITIATOR DETECTED ERROR MESSAGE RECEIVED. It sends the CHECK

 

CONDITION status and the COMMAND COMPLETE message and then

 

goes to the BUS FREE phase.

 

 

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 Initiator Detected Error Message 05h, Drive Response to Initiator Detected Error Message
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