JPH08329625A - Alternate processing method in disk storage device and disk storage device - Google Patents

Abstract

PURPOSE: To maintain the data by automatically performing alternative processing even when the data are read out of a disk medium and informing a host program of that purpose. CONSTITUTION: The data are read in by a data read-in means 11, and when the fact that the necessity of alternation exists is decided by an alternate decision execution means 12, a standby data area is retrieved by a standby data area retrieval means 13. Then, when the standby data area exists, the read in data are alternated to the standby data area by an alternate execution means 14, and the fact that the alternate processing occurs or read-in re-try corresponding to the alternate process occurrence occurs is reported to a read-in request origin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternative processing method for a disk type storage device and a disk type storage device,
In particular, the present invention relates to a storage information substitution process of re-registering storage information such as a defective sector formed in a magnetic disk device or the like in the spare data area and notifying the execution of the substitution process as warning information.

[0002]

2. Description of the Related Art As a conventional known example, Japanese Patent Laid-Open No. 4-266 is known.
Japanese Patent Publication No. 117 (memory device) is known.

In this conventional alternative processing method for reading data from a storage device, when a certain sector is read over a preset number of retries, the sector is automatically replaced with a spare data area. Then, the read request source was notified of the normal end.

[0004]

In the conventional alternative processing method described above, the alternative processing at the time of reading data as described above cannot be performed when the spare data area is completely used up. In this case, considering data protection, it is desirable to perform device replacement and move new data to the replaced device.

However, in the conventional Japanese Unexamined Patent Publication No. 4-266117 (storage device), the read request source normally terminates the requested data reading process with the replacement process or without the replacement process. Since it is not possible to determine whether the spare data area is used or not, the timing of device replacement cannot be determined, and there is a possibility that data may be destroyed and information assets may be lost.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to notify a read request source that a substitute process has occurred and has ended normally when the substitute process has occurred and ended normally in the data read process. By doing so, it is possible to solve the above problems, allow the read request source to grasp the usage status of the spare data area, replace the device at an optimum time, and secure the data.

Therefore, according to the alternative processing method of the present invention, when the number of retries for error correction occurring when reading data from the disk medium exceeds the number of retries required for the alternative processing, the storage area in which the retry has occurred is deleted. It is characterized in that the read request source is notified that the replacement processing has been performed by replacing the reserved storage area that is secured in advance.

The disk type storage device of the present invention includes a data reading means for reading data from a disk medium, an alternative execution retry number setting means for presetting the number of retries for which an alternative process is required, and a data reading means for generating data. The alternative execution determination unit that determines whether to execute the alternative process from the retry count for error correction and the retry count set by the alternative execution retry count setting unit, and the alternative execution determination unit determines that the alternative process is necessary. If there is a spare data area, the spare data area searching means for searching for a spare spare data area and the spare data area search result by the spare data area searching means If there is a spare data area Read the alternative execution means to allocate to the area and the fact that the alternative processing has occurred. It is characterized by having a end notification determination means for notifying seen requester.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the disk type storage device of the present invention, and FIG. 2 is a flow chart showing the processing of a data read error alternative processing method in the disk type storage device of FIG.

The disk type storage device of this embodiment comprises a data reading means 11 for reading data from a disk medium,
An alternative execution determination unit 12 that determines whether or not to execute an alternative process based on the number of retries at the time of reading the data by the data reading unit 11, and a spare data area search unit 13 that searches for an empty spare data area from the spare data areas. As a result of the spare data area search by the spare data area search means 13, if there is a spare data area, the alternative execution means 14 for allocating the area in which a retry has occurred to the spare data area, and the read request source are notified by the presence or absence of alternative processing. It has an end notification determining means 15 for determining the end state and an alternative execution retry number setting means 16 for presetting the number of retries for which the alternative process is required.

Next, a data read error alternative processing method in the disk type storage device of this embodiment will be described with reference to FIGS.

First, the number of read error retries for which substitution is considered necessary is set in advance by means 16 for setting the number of execution retries for substitution.
Set to.

When the data reading means 11 completes the data reading normally (step 21), the alternative execution judging means 12 checks the number of times of data reading retry (step 22). When the number of retries is equal to or greater than the number of alternative execution retries set in the alternative execution retry number setting means 16, the auxiliary data area searching means 13 searches the auxiliary data area (step 23) and determines whether or not the auxiliary data area exists. Check (step 24). If there is a spare data area, the data read by the substitution executing means 14 is replaced with the spare area (step 25).

The end notifying means 15 checks the number of retries (step 26), and if the number of retries is less than the number of alternative execution retries, it notifies the read request source of normal end (step 27), and the number of retries is alternative execution retry. If the number of times is equal to or greater than the number of times, the processing is normally terminated with a condition, and the reading request source is notified that the alternative processing has been performed or the number of retries for which the alternative processing is required has occurred (step 28).

[0016]

As described above, the alternative processing method and disk-type storage device in the disk-type storage device of the present invention perform determination of defective areas based on the number of retries even at normal termination and perform the alternative process in advance. Also, by notifying the read request source that alternative processing has occurred, it is possible to accurately grasp the disc replacement time,
This has the effect of preventing loss of information assets due to data destruction.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a disk type storage device of the present invention.

FIG. 2 is a flowchart showing a process of a data read error alternative processing method in the disk type storage device of FIG.

[Explanation of symbols]

 11 Data Reading Means 12 Alternative Execution Determining Means 13 Spare Data Area Searching Means 14 Alternative Executing Means 15 End Notification Determining Means 16 Alternative Execution Retry Count Setting Means

Claims (2)

[Claims] 1. A spare storage area in which a storage area in which a retry has occurred is reserved in advance when the number of retries for error correction that occurs when reading data from a disk medium exceeds the number of retries for which alternative processing is required. And a method of notifying the read request source that the alternative processing has been performed. 2. A data reading unit for reading data from a disk medium, an alternative execution retry number setting unit for presetting the number of retries for which an alternative process is required, and an error recovery unit for recovering an error that occurs when the data reading unit reads the data. An alternative execution determining unit that determines whether to execute an alternative process based on the number of retries and the number of retries set by the alternative execution retry number setting unit, and a spare when the alternative process determining unit determines that the alternative process is necessary If there is a spare data area as a result of the spare data area search means by the spare data area searching means for searching for a spare spare data area among the data areas, the area where the retry occurs is the spare data area Read the alternative execution means to be assigned to and the occurrence of the alternative processing by the alternative execution means. A disk-type storage device, comprising: an end notification determining means for notifying only a request source.