Chapter 4 SCSI Commands
Overview of SCSI Command and Status Processing
DLT-S4 Interface Reference Guide
25
Table 11 Status Codes
Autosense
4
Autosense is the automatic return of sense data to the application client
coincident with the completion of a SCSI command ending in
CHECK
CONDITION
.
When a command ends with a
CHECK CONDITION
, sense data (that
describes the reason for the
CHECK CONDITION
) is generated. If the
interface supports autosense, then the drive automatically returns the
sense data with the status for the command that ended with a
CHECK
CONDITION
. If the interface does not support autosense, then the host
issues a
REQUEST SENSE
command to find out what the sense data is.
The sense data that is returned automatically, would still have the same
format as the sense data that is returned by the
REQUEST SENSE
command.
Status Code
Definition
Meaning
00h
GOOD
The drive successfully completed the
command.
02h
CHECK
CONDITION
An exception condition occurred.
08h
BUSY
The drive cannot currently service the
command and has discarded the CDB.
The initiator may retry the command
later.
18h
RESERVATION
CONFLICT
The drive cannot process the command
because another initiator has
established a reservation and the
command is subject to reservations.
28h
TASK SET FULL
The drive does not have the resources
to presently accept the command. The
initiator should retry the command at
another time, preferably after status is
received for a currently outstanding
command to the drive.
Note:
While Fibre Channel and Serial Attached SCSI always support
Autosense, Parallel SCSI only supports Autosense when
running in Information Unit Mode.
