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C141-E035-03EN 6 - 3
The IDD does not reply to the SCSI bus for up to 2 seconds after the initial self-diagnostics is
started. After that, the IDD can accept the I/O operation request correctly, but the received
command, except the executable commands under the not ready state (such as INQUIRY,
START/STOP UNIT), is terminated with the CHECK CONDITION status (NOT READY
[=2]/logical unit not ready [=04-00]) during the interval from the spindle motor becomes
stable to the IDD becomes ready. The executable command under the not ready state is
executed in parallel with the initial self-diagnostics, or is queued by the command queuing
feature and is executed after completion of the initial self-diagnostics. When the command
that comes under the exception condition of the command queuing is issued at that time, the
IDD posts the BUSY status for the command. When the error is detected during the initial
self-diagnostics, the CHECK CONDITION status is posted for all commands that were
stacked during the initial self-diagnostics. For the command execution condition, refer to
Section 1.4 and Subsection 1.7.4 in SCSI Logical Interface Specifications.
(2) Online self-diagnostics (SEND DIAGNOSTIC command)
The INIT can make the IDD execute self-diagnostics by issuing the SEND DIAGNOSTIC
command.
The INIT specifies the execution of self-diagnostics by setting 1 for the SelfTest bit on the CDB in
the SEND DIAGNOSTIC command and specifies the test contents with the UnitOfl bit.
When the UnitOfl bit on the CDB is set to 0, the IDD executes the hardware function test only
once. When UnitOfl bit is set to 1, the IDD executes the hardware function test, seek
(positioning) test, and data write/read test for the Internal test space only once.
a. Error recovery during self-diagnostics
During the self-diagnostics specified by the SEND DIAGNOSTIC command, when the
recoverable error is detected during the seek or the write/read test, the IDD performs the
error recovery according to the MODE SELECT parameter value (read/write error recovery
parameter, additional error recovery parameter) which the INIT specifies at the time of
issuing the SEND DIAGNOSTIC command.
PER Operation of self-diagnostics
0 The self-diagnostics continues when the error is recovered. The self-
diagnostics terminates normally so far as the unrecoverable error is not
detected.
1 The self-diagnostics continues when the error is recovered. If the
unrecoverable error is not detected, the consecutive tests are executed till
last test but the self-diagnostics terminates with error. The error
information indicates that of the last recovered error.
b. Reporting result of self-diagnostics and error indication
When all specified self-diagnostics terminate normally, the IDD posts the GOOD status for
the SEND DIAGNOSTIC command.