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Advanced Diagnostics SCSI Errors

RETAIN H00727 SCSI Fixed Disk Diagnostic Error Return Codes [9XYY]

The SCSI error codes for Advance Diagnostics are different from the SCSI POST error (QEET) codes provided in the HMM, Form #S52G-9971 - 01. If SCSI errors occur during POST, the Advanced Diagnostics should be run prior to any parts being replaced.

When the SCSI Fixed Disk Diagnostic Test detects a failure in a hard file, a 12 character error code is generated which consists of the 8 digit SCSI ERROR CODE, plus the 4 digit ERROR RETURN CODE.

Error code 0210401H 9231 was provided by Advanced Diagnostics during an actual service incident. This error is decoded as:

  0210401H 9231     (actual error code)
  0210PLSC 9XYY     (decoding key)

   0210  - means non-removal fixed disk media (hard file).
   P     - PUN (Physical unit number, ie. SCSI ID=4)
   L     - LUN (Logical unit number, 0 on fixed disks)
   S     - micro channel slot of the SCSI adapter
   C     - capacity code of the specific fixed disk being tested

   9     --> UNIT REFERENCE CODE      (Important, See note below)
   X     --> SENSE KEY                (Refer to Chart 1, below)
   Y |-----> ADDITIONAL SENSE CODE    (Refer to Chart 2, below
   Y |                                 00 - 5D are valid codes)

The first 8 characters are not error specific and only point to the device under test. The RETURN CODE is more specific to the failure and may be decoded by first referring to the SENSE KEY in Chart 1 and then referring to the ADDITIONAL SENSE CODES from chart 2. Some of the SENSE KEY and ADDITIONAL SENSE CODES represent a probable software problem. Operating System software has the capability of receiving this information and using it to provide detailed error information to the user, or to execute error recovery processes. The use of this capability varies by design from operating system to operating system.

Note: If the Unit Reference Code is other than a '9', the following SENSE KEY and ADDITIONAL SENSE CODES (Charts 1 and 2) have DIFFERENT meanings and SHOULD NOT be used.

CHART 1 SENSE KEY DESCRIPTION

0	NO SENSE KEY	No sense key information is available
1	RECOVERED ERROR	Last command completed successfully with recovery action performed by device.
2	NOT READY	Logical unit addressed cannot be selected.
3	MEDIA ERROR	Command terminated with non-recoverable error condition caused by an error in recorded data or a flaw in media (disk).
4	HARDWARE ERROR	Device detected non-recoverable hardware error while performing a command or during diagnostic test.
5	ILLEGAL REQUEST	Illegal parameter in command descriptor block or additional parameter supplied as data. Probable software error.
6	UNIT ATTENTION	Device RESET by power-on sequence, bus DEVICE RESET message, HARD RESET, removable media was removed/inserted, or Mode Select command issued.
7–A	N/A	(Unused)
B	ABORTED COMMAND	Device aborted command.
C-D	N/A	(Unused)
E	MISCOMPARE	Source data did not match data read from media on Write Verify or Verify command.
F	N/A	(Unused)

CHART 2 ADDITIONAL SENSE CODE DESCRIPTION

00	No Additional Sense Information Is Available
01	No Index Or Sector Was Found	Low-level format drive. If diags run error-free, drive is serviceable.
02	Seek Incomplete	Time required to physically move head/arm assembly or switch heads exceeds specified limits. Probable hardware failure.
03	Write Fault.	Track position or write circuit fault detected during write. Not always a hardware failure. A physical jolt to drive during write operation could cause this. Isolated occurrence does not mean a hardware failure.
04	Drive Not Ready	Spindle motor speed out of spec or device requires a motor start command, command not issued. Power-off-on and retest drive.
09	Track Following Error	Actuator position can't be maintained over given track. Probable hardware failure.
0C	Write Error	Failure occurred during write (probably with Verify on) and auto-reallocation of sector failed or not supported on this type drive. Low-level format or sector re-assigned. If diags run error-free, drive is serviceable.
10	ID CRC	Read error detected in ID field of sector during read or write. Low-level format drive. If diags run error free HD is serviceable.
11	Unrecoverable Read Error	Occurred in the data field of the sector that could not be corrected. Sector should be re-written, reassigned, or low-level format done. If diags run error-free, drive is serviceable.
14	No Record Found	SCSI device can't find requested record. Low-level format drive, retest. If no errors occur, drive is serviceable.
15	Seek Positioning Error	Positioning of head/arm assembly to a new location failed. Probable hardware failure.
16	Data Synchronization Mark Error	Sync byte at data field cannot be detected. Low-level format drive. If diagnostics run error-free, the disk is serviceable.
17	Recovered Read Data without ECC	ECC check bytes calculated from data read during first read operation doesn't match ECC check bytes appended to data field and did match on subsequent read operation. Possible minor media defect. Rewrite, re-assign sector, or low level format drive and re-run diagnostics. If no error is detected, disk is serviceable.
18	Recovered Read Data With ECC	ECC check bytes calculated from data read during first read doesn't match ECC check bytes appended to data field, ECC correction applied on subsequent read. Possible minor media defect. Rewrite re-assign sector or low level format drive and re-run diagnostics. If no error, fixed disk is serviceable.
19	Defect List Error	Data error detected while reading manufacturing defect list or while reading or writing grown defect list. Low-level format, ignore grown defect list, retest drive. If no errors, drive is serviceable.
1A	Parameter List Length Error	Command operation code received by device invalid. Probable software problem.
1B	Synchronous Data Transfer Error	Error during data transmission. Check cable connections, cable termination, excessive cable length, and retest.
1D	Compare Error	Data read from media doesn't match data written to media on a Write with Verify command. Probable hardware problem.
20	Invalid Command Operation Code	Command operation code received by device is not supported.
21	Illegal Logical Block Address	Logical block address requested outside range supported by device. Probable software problem.
24	Illegal Field In The CDB	Device detects unexpected values in any field of CDB (Command Descriptor Block) Probable software problem.
25	Illegal LUN	LUN field in CDB not supported. Probable software problem.
26	Illegal Field In The Parameters List	Device detects unexpected values in any field of parameter list. Probable software problem.
28	Removable Medium Changed	(Not applicable for fixed disk drives.)
29	Power-On Reset - or - Bus Device Reset	POR / bus device reset sense code indicates device (drive) reset. Reset due to software issued commands or defective hardware.
2A	Mode Select Parameters Changed	Not a hardware failure. Software or diagnostic code problems [?].
31	Media Format Corrupted	Media format appears corrupted or interrupted (power down, reset, etc.) prior to completion of Format Unit command. Format Unit command should be re-issued and must complete successfully for this error condition to be removed.
32	No Defect Spare Location Available	Reassign Block Command cannot successfully complete because all available spare sectors used. Low-level format, ignore grown defect list, and retest drive. If no errors, drive is serviceable.
3F	Operating Condition On The Device Has Been Changed	This is probably a software error.
40	Component Failure	Drive self-test diagnostics detected failure (Hardware) in device.
43	Message Reject Error	Inappropriate or unexpected Message Reject received from SCSI Adapter/A or SCSI Adapter/A rejects a message twice.
44	Internal Controller Error	Internal microprocessor detects incorrect status or receives an illegal request from device electronics. Hardware failure.
45	Select/Re-Select Failed	SCSI Adapter fails to respond to re-selection within 250 ms after device gains bus arbitration. Re-selection attempted second time before setting select/re-select failed status.
47	SCSI Interface Parity Error	Device detects incorrect parity on SCSI data bus (CABLE). Check cable connections, termination, length (max 6m or approx. 20 feet).
48	Initiator Detected Error	SCSI Adapter/A detects error, sends retry message, detects error again, sends retry message 2nd time. Probable hardware problem.
49	Inappropriate/ Illegal Message	SCSI Adapter/A sends message that is not supported or is not in a logical sequence. Probable software error.
4C	Logical Unit Failed Self Configuration	Probably a hardware failure in device being tested.
4E	Overlapped Commands Attempted	Probable software error.
5D	Predictive Failure Analysis Threshold Reached	Predetermined number of errors reached. Back-up data and service/replace fixed disk as appropriate.

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