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1.7 Command Processing Exceptions
C141-E167 1 - 29
Table 1.6 Reset processing during write
Type of command Halting process of command execution
WRITE
WRITE EXTENDED
WRITE AND VERIFY
SEND DIAGNOSTIC (Write/Read Test)
WRITE LONG
WRITE SAME
Data blocks which are currently being written are
processed normally, including the ECC portion, and
execution of the command is terminated at the point when
that processing is completed. Not all the data transferred
from the INIT to the IDD will necessarily be written to the
disk media.
FORMAT UNIT At the point when processing of the data block that is
currently being written (initialized) is completed,
execution of the command is halted. Since the formatting
results cannot be guaranteed for the entire disk surface, it
is necessary for the INIT to reissue the command.
REASSIGN BLOCKS At the point when processing of alternate blocks which are
currently being assigned is completed, execution of the
command is halted. Not all the alternate blocks specified
for reassignment processing by the INIT will necessarily
have been processed.
MODE SELECT
MODE SELECT EXTENDED
LOG SENSE (Specifying parameter save)
If a parameter save operation has already started, that
command is executed until it is completed. However,
since the INIT cannot judge whether the parameters have
been saved or not, it is necessary for the INIT to confirm
the status by the MODE SENSE command or the LOG
SENSE command, or reissue the command.
SYNCHRONIZE CACHE Data blocks which are currently being written are
processed normally, including the ECC portion and the
command is halted at the point when that processing is
completed. Not all the data which is the write object will
necessarily be written to the disk media.
1.7.7 Fatal hardware errors
(1) Self-diagnostic errors
If a hardware fatal error is detected during the initial self-diagnosis, in off-line self diagnosis or in on-
line self-diagnosis (SEND DIAGNOSTIC command), rotation of the spindle motor will be halted.
When in this state, the IDD reports the CHECK CONDITION status for all input/output operation
requests except the REQUEST SENSE command. The sense data reported at this time indicate
HARDWARE ERROR [=4] / Diagnostic failure on component “nn” [=40-nn]. It is necessary for the
INIT either to generate a RESET condition or send a TARGET RESET message and attempt to
recover from the error state. For recommended procedures for error recovery methods, see the
explanation in Section 5.2 “INIT’s Error Recovery Methods (Recommended).” Furthermore, see
Section 6.1.1 “Self-diagnostic Function” in “Product Manual.”
(2) Unrecoverable hardware errors
Limited to cases in which a fatal hardware error occurs during execution of a command, and
termination processing such as a CHECK CONDITION status report cannot be executed, the IDD
may halt rotation of the spindle motor.