Operating instructions

A-6
SCSI REFERENCE 1012975
CHAPTER A—ERROR CODES
A.2 ERRORS REPORTED OVER THE SCSI BUS
If the autoloader is operating in Random mode, errors are reported over the
SCSI bus. Some of these errors also appear on the LCD, others do not. Errors
reported over the SCSI bus are associated with the sense key data returned by
the autoloader in response to a REQUEST SENSE command (see Chapter 18).
These error codes include the following error information:
 The sense key (SK), Additional Sense Codes (ASCs), and Additional Sense
Code Qualifiers (ASCQs) associated with the error. The ASC and ASCQ
codes provide additional information for each sense key. See Table 18-1 on
page 18-3 for definitions of the sense keys.
 The Exabyte-unique Fault Symptom Codes (FSCs). These codes can be used
to determine the nature of hardware and software errors and other events.
The Fault Symptom Codes are defined on page 8-15.
This section lists the possible combinations of values for the Additional Sense
Code (ASC) and the Additional Sense Code Qualifier (ASCQ) fields in the
Extended Sense data returned by the REQUEST SENSE (03h) command. Each
ASC and ASCQ combination is associated with one or more Sense Key values,
and one or more FSCs.
For ease of reference, Ta b l e A - 2 lists all of the possible ASC, ASCQ, Sense Key,
and FSC values returned by the autoloader, sorted in ascending ASC/ASCQ
order. Each combination of values is accompanied by one or more cause codes
and one or more error recovery procedure codes (ERPs). Tab l e A - 3 o n
page A-12 lists the same information as Ta b l e A - 2 , but it is sorted in ascending
FSC order. The ERPs are described in Section A.3 on page A-18.
Note: When two or more ERP codes are listed for a Fault Symptom Code,
attempt the recovery procedures in the order listed.
Cause Key:
A= Application software L= Autoloader
B= Bus (SCSI) O= Operator
D= Drive S= System
I= Information message T= Ta pe