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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.
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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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