Fujitsu MAP3367, MAP3147, MAS3735, MAP3735, MAS3367 Outline of Scsi Bus Error Recovery Processing

		1.7	Command Processing Exceptions
		Table 1.4 Outline of SCSI Bus Error Recovery Processing
	Item	Type of Error	Error Recovery Processing
1		MESSAGE OUT phase parity error	Retry the erroneous phase up to 3
			times max / "CHECK
			CONDTION"Status
2		COMMAND phase parity error	Retry the erroneous phase up to 3
			times max / "CHECK
			CONDTION"Status
	3	DATA OUT phase parity error	"CHECK CONDTION"Status
4		Received INITIATOR DETECTED ERROR message.	Retry the erroneous phase up to 3
			times max / "CHECK
			CONDTION"Status
	5	Received MESSAGE PARITY ERROR message.	Re-execute RESELECTION phase
	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	Outline of disk drive error recovery processing
Item	Type of Error		Error Recovery Processing
1	Seek Error		Rezero (Return to Zero Cylinder), readjustment of positioning
			control system, and repositioning to the data block.
2	Uncorrectable Data Error		Reread
3	Correctable Data Error		Correct by ECC.

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.

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