Request Sense
Julyl 2017 Command Set 219
Sense Data
Sense data is available when:
• The previous command to the specified I_T_L nexus terminated with Check
Condition status. Multiple errors might occur during the processing of a single
SCSI command. The sense key reflects the first error that occurred.
• The Request Sense command was issued to an unsupported LUN. In this case, the
library does not return a check condition and returns sense data:
• Sense Key set to Illegal Request (05h).
• ASC set to Logical Unit Not Supported (25h).
• ASCQ set to 00h.
If no sense data is available for the specified I_T_L nexus, the library returns sense
data:
• Sense Key set to No Sense (0h)
• ASC set to No Additional Sense Information (00h)
• ASCQ set to 00h
The library returns Check Condition status for a Request Sense command only to
report errors specific to the command itself.
For example: A non-zero reserved bit is detected in the CDB.
If a recovered error occurs during the execution of a Request Sense command, the
library returns the sense data with Good status. If the library returns a Check
Condition status for a Request Sense command, the sense data might be invalid.
For example: A non-zero reserved bit is detected in the CDB.
If a recovered error occurs during the execution of a Request Sense command, the
library returns the sense data with Good status. If the library returns a Check
Condition status for a Request Sense command, the sense data might be invalid.