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Table 1.4
Item
1
MESSAGE OUT phase parity error
2
COMMAND phase parity error
3
DATA OUT phase parity error
4
Received INITIATOR DETECTED ERROR message.
5
Received MESSAGE PARITY ERROR message.
6
RESELECTION phase time-out
(2)
Recovery procedures for disk drive errors
The IDD executes error recovery listed in Table 1.5 for an error detected during access to data on the
disk. Note that the recovery increases command processing time because of rotation delay for
repositioning to the data block on the disk or initialization of the positioning control system.
The INIT can use the MODE SELECT parameter Page 1 (read/write error recovery parameter), Page
7 (verify error recovery parameter), and Page 21 (additional error recovery parameter) to control the
retry count. However, use the default value specified by the IDD in general operation.
Table 1.5
Item
1
Seek Error
2
Uncorrectable Data Error
3
Correctable Data Error
Note:
The execution start timing of this automatic readjustment operation generally cannot be predicted
by the INIT. The automatic readjustment operation is performed when there are no commands
being executed or in the queue, but execution of commands issued immediately after the IDD
starts the readjustment operation, are forced to wait until the readjustment operation is
completed.
C141-E167
Outline of SCSI Bus Error Recovery Processing
Type of Error
Outline of disk drive error recovery processing
Type of Error
Rezero (Return to Zero Cylinder), readjustment of positioning
control system, and repositioning to the data block.
Reread
Correct by ECC.
1.7 Command Processing Exceptions
Error Recovery Processing
Retry the erroneous phase up to 3
times max / "CHECK
CONDTION"Status
Retry the erroneous phase up to 3
times max / "CHECK
CONDTION"Status
"CHECK CONDTION"Status
Retry the erroneous phase up to 3
times max / "CHECK
CONDTION"Status
Re-execute RESELECTION phase
Error Recovery Processing
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