REQUEST SENSE 03h
Commands
157
reported. When the host reads sense data with a REQUEST SENSE, it will see an error for the
WRITE with residue information indicating data lost for that write and previous writes.
• If the command is not a write command and the Deferred Error check is performed as part
of the pre-execution checks,
CHECK CONDITION status is reported. The DEFERRED ERROR
sense is copied to Current sense. The
DEFERRED ERROR sense is cleared. The host is
expected to retrieve the sense by sending a
REQUEST SENSE, otherwise the data will be lost.
Bus release deferred errors:
The drive will release the bus to terminate an operation (such as READ) when the host sends an
ABORT message or when the drive fails to send status due to a catastrophic error.
In each case, the operation does not terminate immediately since the logical position will have to
be established on the other side of the block that was about to be transferred, or was being
transferred. If an error subsequently occurs while trying to complete the read, the sense generated
is a
DEFERRED ERROR. It is therefore possible but highly unlikely to have DEFERRED ERROR sense
flagged for a command without immediate report.
Sense keys
The following table lists the sense keys that may be returned by HP Ultrium drives. SCSI sense keys
are 4-bit codes returned in the sense data. They indicate in what general area the problem that
has just been experienced falls. For a clearer indication of the nature of the problem, refer to the
additional sense code.
Code Name Description ASC/Qs
0h NO SENSE There is no real problem. The sense information is
probably indicating some condition (such as
encountering a filemark).
0000h, 0001h, 0002h,
8282h
1h RECOVERED ERROR Returned if a Mode Select parameter is truncated
or if a TapeAlert event is being reported.
5D00h, 3700h
2h NOT READY The drive is not in a state to be able to execute
the request. See also the Media Access check.
0400h, 0401h, 0402h,
3003h, 3007h, 3A00h,
3E00h
3h MEDIUM ERROR The command failed, believed to be caused by a
problem with the tape.
0002h, 0004h, 0407h,
0410h, 0C00h, 1100h,
1102h, 1400h, 3001h,
3002h, 3004h, 3100h,
3B00h, 5000h, 5200h,
5300h
4h HARDWARE ERROR The command failed, believed to be caused by a
problem with the drive hardware.The FRU in the
sense data should indicate which part of the
hardware is faulty.
0403h, 40XXh, 4400h,
5100h, 5300h
