Quantum DLTtape DLT 7000, Product Manual

Page: 99 / 312

Messages
Quantum DLT 7000 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.