WO2007087012B1 - Write recovery of erroneous data - Google Patents

Write recovery of erroneous data

Info

Publication number
WO2007087012B1
WO2007087012B1 PCT/US2006/046402 US2006046402W WO2007087012B1 WO 2007087012 B1 WO2007087012 B1 WO 2007087012B1 US 2006046402 W US2006046402 W US 2006046402W WO 2007087012 B1 WO2007087012 B1 WO 2007087012B1
Authority
WO
WIPO (PCT)
Prior art keywords
lba
write
reassignment
data
storage device
Prior art date
Application number
PCT/US2006/046402
Other languages
French (fr)
Other versions
WO2007087012A2 (en
WO2007087012A3 (en
Inventor
Allen King
Original Assignee
Allen King
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US11/333,763 external-priority patent/US20070174678A1/en
Application filed by Allen King filed Critical Allen King
Publication of WO2007087012A2 publication Critical patent/WO2007087012A2/en
Publication of WO2007087012A3 publication Critical patent/WO2007087012A3/en
Publication of WO2007087012B1 publication Critical patent/WO2007087012B1/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1883—Methods for assignment of alternate areas for defective areas
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/14—Error detection or correction of the data by redundancy in operation
    • G06F11/1402—Saving, restoring, recovering or retrying
    • G06F11/1415—Saving, restoring, recovering or retrying at system level
    • G06F11/1435—Saving, restoring, recovering or retrying at system level using file system or storage system metadata
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1833—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1879—Direct read-after-write methods
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1883—Methods for assignment of alternate areas for defective areas
    • G11B2020/1893—Methods for assignment of alternate areas for defective areas using linear replacement to relocate data from a defective block to a non-contiguous spare area, e.g. with a secondary defect list [SDL]
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2508—Magnetic discs
    • G11B2220/2516—Hard disks

Abstract

An apparatus, system, and method are disclosed for a storage device's enforcing write recovery of erroneous data. The storage device enforces write recovery leading to a reassignment and re- write for the defective data block by the storage controller at a subsequent write opportunity with a usual write without verify command. The invention enables the storage device to identify, and re-discover the defect by automatically verifying the data written, and report an unrecovered write error to the storage controller on said write command, causing said write recovery to occur.

Claims

AMENDED CLAIMS received by the International Bureau on 14 November 2007 (14.11.2007)
1. An apparatus for a storage device's enforcing write recovery of erroneous data, the apparatus comprising: a reassignable check module configured to determine whether the logical block address ("LBA") of a data block specified by a write without verify command is included in the storage device's reassignment log, the reassignment log comprising a list of LBAs of defective data blocks to be reassigned by a storage controller and configured to remove the LBA of a defective data block from the list subsequent to a reassignment of said data block, the defective data blocks comprising data blocks that were found to have unrecovered read errors, and reported and unreported marginally recovered read errors deemed likely to lead to unreadability of the contained data by the storage device; an auto verify module configured to automatically verify that data is correctly written at the LBA on said write command if the LBA is listed in said reassignment log; and an error posting module configured to report to the storage controller an unrecovered write error in response to the LBA' s failing the auto verify.
2. The apparatus of claim 1, wherein the storage controller reassigns the LBA subsequent to unsuccessful write retries and rewrites data at the reassigned location in
42 response to the error posting module report.
3. The apparatus of claim 2, wherein the auto verify module retries the auto verify while the storage controller retries a failing write until a reassignment is made.
4. The apparatus of claim 1 , wherein the auto verify module performs data verification by means of an error correction code ("ECC") appended to the data.
5. The apparatus of claim 1, wherein the auto verify function is enabled and disabled at a storage device user's option.
6. A system for a storage device's enforcing write recovery of erroneous data, the system comprising: at least one host computer; at least one storage controller, without a memory for maintaining a data error table, selected from a group consisting of a non-array storage controller and an array storage controller, and coupled to the host computer; a storage device, coupled to the storage controller, the storage device comprising: an interface module; a head disk assembly a processor; a memory; a positioning control module;
43 a read-write data handler module; a reassignable check module configured to determine whether the LBA of a data block specified by a write without verify command is included in the storage device's reassignment log, the reassignment log comprising a list of LBAs of defective data blocks to be reassigned by the storage controller and configured to remove the LBA of a defective data block from the list subsequent to a reassignment of said data block, the defective data blocks comprising data blocks that were found to have unrecovered read errors, and reported and unreported marginally recovered read errors deemed likely to lead to unreadability of the contained data by the storage device; an auto verify module configured to automatically verify that data is correctly written at the LBA on said write command if the LBA is listed in said reassignment log; and an error posting module configured to report to the storage controller an unrecovered write error in response to the LBA's failing the auto verify.
7. The system of claim 6, wherein the storage controller reassigns the LBA subsequent to unsuccessful write retires and rewrites data at the reassigned location in response to the error posting module report.
44
8. The system of claim 7, wherein the auto verify module retries the auto verify while the storage controller retries a failing write until a reassignment is made.
9. The system of claim 6, wherein the auto verify module activates the auto verify operation following a successful completion of the write operation.
10. The system of claim 6, wherein the storage device coupled to a plurality of storage controllers in a multiple-storage controller system enforces said write recovery of erroneous data on each said storage controller.
11. The system of claim 6, wherein if the storage device is replaced with another storage device, said enforced write recovery of previously found erroneous data is discontinued.
12. The system of claim 6, wherein the storage device interface module provides a storage controller coupling interface the type of which is selected from the group consisting of Small Computer System Interface ("SCSI") Parallel Interface ("SPI"), Serial Attached SCSI ("SAS"), Fibre Channel ("FC"), Fibre Channel-Arbitrated Loop ("FC-AL"), Advanced Technology ("AT") Attachment ("ATA"), Serial ATA ("SATA"), Universal Serial Bus ("USB"), IEEE 1394, and variants and enhancements thereof.
13. A signal bearing medium tangibly embodying a program of machine- readable instructions executable by a digital processing apparatus to perform operations to allow a storage device to enforce write recovery of erroneous data, the operations comprising: determining reassignability of the LBA of a data block specified by a write without verify command based on contents of the storage device's reassignment log, the reassignment log comprising a list of LBAs of defective data blocks to be reassigned by a storage controller and configured to remove the LBA of a defective data block from the list subsequent to a reassignment of said data block, the defective data blocks comprising data blocks that were found to have unrecovered read errors, and reported and unreported marginally recovered read errors deemed likely to lead to unreadability of the contained data by the storage device; auto verifying that data is correctly written at the LBA on said write command if the LBA is listed in said reassignment log; reporting to the storage controller an unrecovered write error in response to the LBA's failing the auto verify; and reassigning and rewriting the failed LBA in response to the storage controller's receiving said write error report.
14. The signal bearing medium of claim 13, wherein the instructions further comprise operations to skip auto verify on said write command if the specified LBA is not listed in said reassignment log.
46
15. The signal bearing medium of claim 13, wherein the instructions further comprise operations to activate the auto verify operation following a successful completion of the write operation.
16. The signal bearing medium of claim 13, wherein the instructions further comprise operations to auto verify the written data by means of the ECC appended to the data.
17. The signal bearing medium of claim 13, wherein the instructions further comprise operations to remove the LBA from the storage device's reassignment log upon a successful completion of the auto verify.
18. The signal bearing medium of claim 13, wherein the instructions further comprise operations to retry the auto verify while the storage controller retries a failing write until a reassignment is made.
19. The signal bearing medium of claim 13, wherein the instructions further comprise operations to enable and disable the auto verify function according to the setting of a storage device user's option.
20. A method for a storage device's enforcing write recovery of erroneous data, the method comprising: determining reassignability of the LBA of a data block specified by a write without verify command based on contents of the storage device's
47 reassignment log, the reassignment log comprising a list of LBAs of defective data blocks to be reassigned by a storage controller and configured to remove the LBA of a defective data block from the list subsequent to a reassignment of said data block, the defective data blocks comprising data blocks that were found to have unrecovered read errors, and reported and unreported marginally recovered read errors deemed likely to lead to unreadability of the contained data by the storage device; auto verifying that data is correctly written at the LBA on said write command if the LBA is listed in said reassignment log; reporting to the storage controller an unrecovered write error in response to the LBA's failing the auto verify; reassigning and rewriting the failed LBA in response to the storage controller's receiving said write error report; and activating the auto verify operation following a successful completion of the write operation prior to a reassignment.
21. The method of claim 20, further comprising skipping the auto verify operation on said write command if the specified LBA is not listed in said reassignment log.
22. The method of claim 20, further comprising removing the LBA from the storage device's reassignment log upon a successful completion of the auto verify.
48
23. The method of claim 20, further comprising retrying the auto verify while the storage controller retries a failing write until a reassignment is made.
24. The method of claim 20, further comprising enabling and disabling the auto verify function according to the setting of a storage device user's option.
25. An apparatus for enforcing a storage device's write recovery of erroneous data, the apparatus comprising: means for determining reassignability of the LBA of a data block specified by a write without verify command based on contents of the storage device's reassignment log, the reassignment log comprising a list of LBAs of defective data blocks to be reassigned by a storage controller and configured to remove the LBA of a defective data block from the list subsequent to a reassignment of said data block, the defective data blocks comprising data blocks that were found to have unrecovered read errors, and reported and unreported marginally recovered read errors deemed likely to lead to unreadability of the contained data by the storage device; means for auto verifying that data is correctly written at the LBA on said write command if the LBA is listed in said reassignment log; means for reporting to the storage controller an unrecovered write error in response to the LBA' s failing the auto verify; means for reassigning and rewriting the failed LBA in response to the storage controller's receiving said write error report;
49 means for activating the auto verify operation following a successful completion of the write operation prior to a reassignment; means for skipping auto verify on said write command if the specified LBA is not listed in said reassignment log; means for auto verifying the written data by means of the ECC appended to the data; and means for removing the LBA from the storage device's reassignment log upon a successful completion of the auto verify.
50
PCT/US2006/046402 2006-01-17 2006-12-04 Write recovery of erroneous data WO2007087012A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US11/333,763 2006-01-17
US11/333,763 US20070174678A1 (en) 2006-01-17 2006-01-17 Apparatus, system, and method for a storage device's enforcing write recovery of erroneous data
US11/523,844 US7490263B2 (en) 2006-01-17 2006-09-20 Apparatus, system, and method for a storage device's enforcing write recovery of erroneous data
US11/523,844 2006-09-20

Publications (3)

Publication Number Publication Date
WO2007087012A2 WO2007087012A2 (en) 2007-08-02
WO2007087012A3 WO2007087012A3 (en) 2007-11-15
WO2007087012B1 true WO2007087012B1 (en) 2008-01-10

Family

ID=38309695

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/046402 WO2007087012A2 (en) 2006-01-17 2006-12-04 Write recovery of erroneous data

Country Status (2)

Country Link
US (2) US7490263B2 (en)
WO (1) WO2007087012A2 (en)

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Also Published As

Publication number Publication date
US7490263B2 (en) 2009-02-10
US20070174682A1 (en) 2007-07-26
USRE41913E1 (en) 2010-11-02
WO2007087012A2 (en) 2007-08-02
WO2007087012A3 (en) 2007-11-15

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