Operating instructions

18-6
SCSI REFERENCE 1012975
CHAPTER 18—REQUEST SENSE (03h)
18.3.1 PRIORITIES OF SENSE BYTES
Multiple errors may occur during the processing of a single SCSI command.
The sense key reflects the last error that occurred. For example, if a message
error occurs after an unrecoverable hardware error, the autoloader handles the
errors in the following manner:
 The message error is reported.
 The hardware error is preserved, and the next motion command issued by
any host terminates with Check Condition status.
 A subsequent REQUEST SENSE command reports the hardware error.
18.3.2 SENSE BYTE PENDING STATUS
When the autoloader reports Check Condition status in response to a
command from an initiator, the autoloader retains the sense byte pending
status, including error information and Check Condition status for the
initiator, until one of the following occurs:
 Error information is reset by the next command execution for the same
initiator.
 Error information is reset by a reset or power-on condition.
18.4 COMMAND STATUS
The autoloader returns a status byte after processing the REQUEST SENSE
command. This section describes when each type of status byte might be
returned.
Good
The autoloader returns Good status when it is able to process the command
without errors.
Busy
The autoloader never returns Busy status for the REQUEST SENSE command.
Reservation Conflict
The autoloader never returns Reservation Conflict status for the REQUEST
SENSE command.