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Messages

Quantum DLT 8000 Tape System 4-9

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.

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Quantum DLT 8000 Manual Página 139