JP2012083980A - Disk controller and write failure detection method of disk controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the pre-detection of a write failure even in an area in which valid data is written.SOLUTION: A disk controller 1 comprises: a hard disk drive 40 for storing data in an area on a disk; a cache memory 30 for temporarily storing the data; and a hard disk control part 10 for reading data stored in a predetermined area of the hard disk drive, temporarily storing it in the cache memory, writing the temporarily stored data in the predetermined area, and detecting the presence/absence of a data write failure.

Description

  The present invention relates to a disk controller and a write failure detection method for the disk controller.

  A technique for detecting a data read failure in a disk controller is known. This technique is called patrol read, for example, and a read failure is detected in advance by reading the relevant area independently of normal data access.

  In addition, the inspection file generated in the work area is written in a predetermined area of the storage medium to be inspected, the inspection file is read from the area, and the read inspection file is compared with the inspection file generated in the work area. Thus, a technique for detecting the presence or absence of an abnormality in a storage medium is known. (For example, refer to Patent Document 1).

JP 2008-152609 A

  In the technique described above, a data read failure can be detected by patrol read, but a write failure to an area where valid data has already been written cannot be detected in advance. This point is the same even when the technique described in Patent Document 1 is used, and it is impossible to detect whether there is an abnormality in the recording medium in an area where valid data has already been written.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a disk control device that enables prior detection of a write failure even in an area where valid data is written, and the disk control device. It is to provide a failure detection method.

  The present invention provides a storage unit that stores data in an area on a disk, a storage unit that temporarily stores data, and reads data stored in a predetermined area of the storage unit and temporarily stores the data in the storage unit. And a control unit for writing the temporarily stored data in the predetermined area and detecting the presence or absence of a write failure of the data.

  According to the present invention, it is possible to provide a disk control device and a failure detection method for the disk control device that enable prior detection of a write failure even in an area where valid data is written.

It is a figure which shows the structure of the write failure detection apparatus which concerns on embodiment of this invention. It is a flowchart which shows the failure detection process which concerns on the same embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a hard disk control device 1 to which the present invention is applied. As shown in the figure, the hard disk control device 1 has a hard disk control unit 10, an interface control unit 20, a cache memory 30, and a hard disk drive 40 (HDD). The hard disk control unit 10 is connected to the cache memory 30 and the interface control unit 20, and the interface control unit 20 is further connected to the hard disk drive 40.

  The hard disk control unit 10 reads data stored in a predetermined area of the hard disk drive 40, temporarily stores it in the cache memory 30, writes the temporarily stored data again into the predetermined area, and writes the data to the failure. The presence or absence of is detected.

  More specifically, the hard disk control unit 10 includes a read control unit 11 and a write control unit 12, and the read control unit 11 and the write control unit 12 execute processing for detecting a data write failure. To do.

  The read control unit 11 reads data stored in a predetermined area of the disk in the hard disk drive 40 via the interface control unit 20 and temporarily stores it in the cache memory 30.

  The write control unit 12 writes the data temporarily stored in the cache memory 30 to a predetermined area in the hard disk drive 40 where the data is read via the interface control unit 20. In addition, when writing data, the write control unit 12 detects whether or not a failure has occurred. When the occurrence of a failure is detected, the write control unit 12 writes the data in another area where no write failure occurs. The other area is set in advance for each system, for example, more specifically, an area other than the predetermined area in the hard disk drive 40 or another hard disk drive connected to the host device. Is an arbitrary area.

  The interface control unit 20 controls data exchange between the hard disk drive 40 and the hard disk control unit 10 under the control of the hard disk control unit 10.

  The cache memory 30 is a memory that temporarily stores data. In the cache memory 30, data is temporarily stored by the hard disk control unit 10, and the temporarily stored data is read out.

  Next, processing executed by the hard disk control unit 10 will be described with reference to FIG. The process described with reference to FIG. 2 is executed at a predetermined timing or periodically.

  The read control unit 11 reads data in a predetermined test area from the hard disk drive 40 via the interface control unit 20 (S101), and temporarily stores the read data in the cache memory 30 (S102). The test area is set by the read control unit 11.

  Next, the write control unit 12 overwrites the data in the test area using the data temporarily stored in the cache memory 30 (S103).

  When overwriting this data, the write control unit 12 determines whether or not a failure has occurred during data writing (S104).

  If the write control unit 12 does not detect the occurrence of a failure when writing data (S104: NO), the write control unit 12 can confirm that no failure occurs when writing data in the test area.

  On the other hand, when the write control unit 12 detects the occurrence of a failure during data writing (S104: NO), the write control unit 12 can write data other than the test area in the hard disk drive 40, for example, via the interface control unit 20. Write data to other areas.

  According to this embodiment, the hard disk control device 1 can overwrite already written data even in an area where valid data is already written, and whether or not a failure occurs during data writing. Can be detected. Therefore, the hard disk control device 1 can detect in advance whether or not a failure has occurred during data writing, and can improve the reliability of the written data.

  Further, the hard disk control device 1 can write data in a writable area other than the test area when a failure occurs during writing. This data writing is performed, for example, in another area in the hard disk drive 40 or a predetermined area in another hard disk drive connected to the host device. In this way, when it is detected that a write failure occurs during data writing, the data can be moved to an alternative area other than the test area, so the hard disk control device 1 is caused by the occurrence of a write failure during data writing. A decrease in processing performance can be avoided.

  As a result of executing the process of moving the data to the alternative area other than the test area at a predetermined timing or periodically, the hard disk control device 1 predetermines an area where a failure may occur when writing data. It is possible to avoid a situation where data is detected and data is written to an area where a write failure occurs.

  Further, when the data read from the test area of the hard disk drive 40 by the read control unit 11 is the same as the initial format pattern, the write control unit 12 performs a process of writing the initial format pattern to the test area, thereby reading Even if the process of temporarily storing the data in the cache memory 30 is not performed, the hard disk control device 1 can achieve the same effects as those described above.

  In addition, this invention is not limited to the above-mentioned embodiment, A various deformation | transformation is possible in the case of the implementation.

  A part or all of the above embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
A storage unit for storing data in an area on the disk;
A storage unit for temporarily storing data;
A controller that reads out data stored in a predetermined area of the storage unit, temporarily stores the data in the storage unit, writes the temporarily stored data in the predetermined region, and detects the presence or absence of a writing failure of the data;
A disk control device comprising:

(Appendix 2)
The disk control device according to appendix 1, wherein the control unit writes the data in an area other than the predetermined area when the data writing failure is detected.

(Appendix 3)
When the data read from the predetermined area is initial format data, the control unit writes the initial format data to the predetermined area without performing temporary processing of the data to the storage unit. The disk controller according to Supplementary Note 1 or 2,

(Appendix 4)
Reading data stored in a predetermined area of the disk;
Temporarily storing the read data; and
Writing the temporarily stored data in the predetermined area;
Detecting the presence or absence of a data write failure;
A failure detection method for a disk controller characterized by comprising:

  The present invention can be widely applied to a disk control device for detecting a data write failure and a failure detection method for the disk control device.

DESCRIPTION OF SYMBOLS 1 ... Hard disk control apparatus 10 ... Hard disk control part 11 ... Read control part 12 ... Write control part 20 ... Interface control part 30 ... Cache memory 40 ... Hard disk drive (HDD)

Claims (4)

A storage unit for storing data in an area on the disk;
A storage unit for temporarily storing data;
A controller that reads out data stored in a predetermined area of the storage unit, temporarily stores the data in the storage unit, writes the temporarily stored data in the predetermined region, and detects the presence or absence of a writing failure of the data;
A disk control device comprising:   2. The disk control apparatus according to claim 1, wherein the control unit writes the data in an area other than the predetermined area when the data writing failure is detected.   When the data read from the predetermined area is initial format data, the control unit writes the initial format data to the predetermined area without performing temporary processing of the data to the storage unit. The disk control device according to claim 1 or 2. Reading data stored in a predetermined area of the disk;
Temporarily storing the read data; and
Writing the temporarily stored data in the predetermined area;
Detecting the presence or absence of a data write failure;
A failure detection method for a disk controller characterized by comprising:

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