JP2005149248A - Metadata restoration system, method thereof, storage device and program therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect that data are lost without requiring a computer to access a data-lost domain when a data-lost error is detected by the internal action of a storage device. <P>SOLUTION: When OS2 starts, a service program 7 loads a metadata recording/determination/restoration part 15 to a control part 10 of a storage device 9. When the control part 10 detects a data-lost error, the metadata recording/determination/restoration part 15 determines whether an error occurrence address exists in a metadata domain or in a file-data domain based on the error occurrence address of the data-lost error of a data storage part 13 and metadata read-out from a metadata back-up part 14, and if the error occurrence address exists in the metadata domain, metadata-domain back-up data of the metadata back-up part 14 are restored to the metadata domain of the data storage part 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a metadata restoration method, method, storage device, and program, and more particularly, to a metadata restoration method, method, storage device, and program in a storage device that is built in or connected to a computer.

Conventionally, in a storage device built in or connected to a computer, the storage device itself self-diagnose a data storage unit inside the device and self-detects an error in the data storage unit. For example, in the case of a RAID (Redundant Arrays of Independent Disks) device, an error is self-detected on the restoration source disk during the restoration operation.

In an example of the prior art, an index area is provided on a disk medium of a disk device in addition to a data area for installing various files and its management area. In the index area, a record describing a set of physical address information indicating a storage position and a file name is registered for each installed file. When a failure occurs at a physical address on a disk medium during operation of the computer system, the failure address is compared with the physical address information of each record registered in the index area, and the name of the file that encountered the failure Is detected. The detected file name is notified to the operator, and the operator restores the file by file replacement. As a result, in the event of a failure that destroys the data on the disk, the file name of the file containing the failure location is identified and notified to the operator, and only the copy of the file containing the failure location can be obtained without reinstalling all files. It can be restored (see Patent Document 1).

Another example of the prior art is a fault tolerance improving apparatus applied to a system that performs predetermined processing by calling a processing program from a hard disk and executing the processing program. During execution of a processing program, data relating to the processing of the processing program itself is stored in a nonvolatile storage device, and the processing program is referred to by referring to the data stored in the nonvolatile storage device when the processing program is restarted after a system failure occurs Continue processing by. As a result, it is possible to improve the fault tolerance by reducing the trouble of recovery when a system failure occurs and at the same time suppressing the loss of data (see Patent Document 2).
JP 2000-235512 (4th page, FIG. 2) JP 2000-259438 (3rd page, FIG. 2)

However, the prior art has the following problems.

The first problem is that data in some areas is lost due to internal operation of the storage device and an unrecoverable error (hereinafter referred to as data lost error) may be detected, but the computer loses data. This means that it is not detected that the data has been lost unless the data area (hereinafter referred to as the data lost area) is accessed.

The second problem is that, in recent years, with the increase in the capacity of hard disk devices, the capacity of stored data has increased, so it is long to restore data in a storage device in which a data lost error has occurred from a backup file. It takes time.

The third problem is that it takes a long time to read all the files stored in the storage device from the computer in order to identify the file in which the data lost error has occurred.

The fourth problem is that when the data lost area is a metadata area for recording metadata such as operating system (hereinafter abbreviated as OS) management information, file system management information, volume manager management information, etc., the OS The file, file system, and volume cannot be recognized.

The fifth problem is that the storage device is used by various OSs, application programs, file system managers, volume managers, etc., but in order for the storage device to determine the management information, the management information is determined. It is necessary to have a table (management information table) to be stored in the storage device. When a new OS or the like is used, it is necessary to update the management information table of the storage device every time.

An object of the present invention is to detect and repair that data is lost even if the computer does not access the data lost area when a data lost error in a part of the area is detected by the internal operation of the storage device. The present invention provides a metadata restoration method, method, storage device and program.

The metadata restoration method of the present invention is an information processing system in which a storage device is connected to a computer via a data transmission / reception interface, wherein the storage device includes a data storage unit including a metadata area and a file data area, and the metadata. When a metadata backup unit for backing up the metadata of the area and a write command and a read command for the storage device are received from an application program running on the OS of the computer, writing and reading to the data storage unit are performed. The storage device control program for updating the file data area and the metadata area and recording the updated contents of the metadata area in the metadata backup unit, and the data lost error detected by the internal operation of the storage device itself It is determined whether the error occurrence address is in the metadata area or the file data area. If the error occurrence address is in the metadata area, the metadata area backup data of the metadata backup unit is stored in the metadata area. Metadata area information in which a data lost error has occurred after restoration is notified to a service program operating on the OS of the computer, and the metadata stored in the metadata area if the error occurrence address is in the file data area A metadata recording / judgment / repair unit that identifies a file name of a file in which a data lost error has occurred and notifies the service program of the file, and the computer records, determines / repairs the metadata when the OS is started Service to load the storage unit into the control unit of the storage device Characterized in that it comprises a program.

The metadata restoration method of the present invention is an information processing system in which a storage device is connected to a computer via a data transmission / reception interface, wherein the storage device includes a data storage unit including a metadata area and a file data area, A metadata backup unit that backs up metadata in the metadata area, and a write command and a read command for the storage device received from an application program running on the OS of the computer, A storage device control program for reading and updating the file data area and metadata area and recording the updated contents of the metadata area in the metadata backup unit, and a data lost self-detected by the internal operation of the storage apparatus itself If the error occurrence address is in the metadata area, the metadata area backup data of the metadata backup unit is transferred to the metadata. The metadata area information in which the data lost error has occurred after the restoration to the area is notified to the service program operating on the OS of the computer, and if the error occurrence address is in the file data area, it is stored in the metadata area. A metadata recording / judgment / repair unit that identifies a file name of a file in which a data lost error has occurred based on the metadata and notifies the service program of the file, and the computer includes an application program and a file in the data storage unit File system in the data area A file system manager for creating a volume, a volume manager for creating a volume for the data storage unit, a service program for loading the metadata recording / judgment / repair unit to the control unit of the storage device when an OS is started, A data transmission / reception unit for transmitting / receiving data to / from the storage device is provided.

Further, according to the metadata repair method of the present invention, the metadata backup unit includes, for each data storage unit name, type information including OS type information, file system type information, volume manager type information, and application type information, and an OS area. It is characterized by metadata area address information including address information, file system area address information, volume manager area address information, application area address information, and data area address information, and metadata area backup data.

On the other hand, the metadata restoration method of the present invention is a service for operating on a computer OS when the computer OS is started in the metadata restoration method for an information processing system in which a storage device is connected to a computer via a data transmission / reception interface. Control when the program receives the process of loading the metadata recording / judgment / restoration unit into the control unit of the storage device and the write command and read command for the storage device from the application program running on the OS of the computer A storage device control program for writing to and reading from the data storage unit to update the file data area and the metadata area and recording the updated contents of the metadata area in the metadata backup unit; The control program When a data lost error is detected during the internal operation of the storage device, the process of notifying the metadata recording / judgment / repair unit of the data lost error detection and the error occurrence address, and the metadata recording / judgment / repair unit The process of determining whether the occurrence address is in the metadata area or the file data area, and if the error occurrence address is in the file data area, the metadata recording / judgment / repair unit When the file name identification process and the error occurrence address are in the metadata area, the metadata recording / judgment / repair unit writes the metadata area backup data of the metadata backup unit back to the metadata area of the data storage unit Process to restore metadata in the data storage unit, and record and judge metadata The repair unit includes a step of notifying the service program of metadata area information in which a file name or data lost error has occurred, and a step of notifying the service program of the file name or metadata area information to the OS. To do.

The metadata restoration method according to the present invention is a metadata restoration method for an information processing system in which a storage device is connected to a computer via a data transmission / reception interface, and a service that operates on the computer OS when the computer OS is started. When the program loads the metadata recording / judgment / restoration unit into the control unit of the storage device and creates a volume for the data storage unit of the storage device by the volume manager operating on the OS of the computer, The storage device control program operating in the process creates a volume by the data storage unit, creates a volume manager area in the metadata area, records volume manager type information in the metadata backup unit, and also creates a volume in the data storage unit. Manager area address Information is recorded in the metadata backup unit, and when the file system is created for the data storage unit of the storage device by the file system manager operating on the OS of the computer, the storage device control program executes the file data in the data storage unit. Create a file system in the area, create a file system area in the metadata area, record the file system type information in the metadata backup unit, and record the file system area address information of the data storage unit in the metadata backup unit A process, a process of creating an OS area in the metadata area of the data storage unit at the time of creating a volume and a file system, and a service program reading OS type information, Communicate to the control A step of recording the OS type information in the metadata backup unit, and recording the file system area address information of the data storage unit in the metadata backup unit, and the OS of the computer When a write command and read command for the storage device are received from the application program running above, the storage device control program updates the file data area and metadata area by writing to and reading from the data storage unit And the step of recording the updated contents of the metadata area in the metadata backup unit, and when the storage device control program detects a data lost error during the internal operation of the storage device, the data lost error detection and the error occurrence address Meta The process of notifying the data recording / judgment / restoration unit, and the metadata recording / judgment / recovery unit generates an error occurrence address based on the error occurrence address and the type information and metadata area address information read from the metadata backup unit. The process of determining whether the data is in the data area or the file data area, and if the error occurrence address is in the file data area, the metadata recording / determination / repair unit specifies the file name and the error occurrence address is When in the metadata area, the metadata recording / judgment / repair unit restores the metadata in the data storage unit by writing the metadata area backup data of the metadata backup unit back to the metadata area of the data storage unit The metadata recording / judgment / restoration unit A step of notifying the metadata area information-error occurs in the service program, service program, characterized by comprising a step of notifying the file name or metadata area information in the OS.

On the other hand, the storage device of the present invention includes a data storage unit comprising a metadata area and a file data area, a metadata backup part for backing up the metadata in the metadata area, and an application program operating on the OS of the computer When a write command and a read command for the storage device are received from the storage device, the file data area and the metadata area are updated by writing to and reading from the data storage unit, and the update contents of the metadata area are updated with the metadata backup The error occurrence address is determined by determining whether the error occurrence address of the data lost error detected by the storage device control program to be recorded in the storage device itself and the internal operation of the storage device is in the metadata area or the file data area. Is meta If it is in the data area, the metadata area backup data of the metadata backup unit is restored to the metadata area, and if the error occurrence address is in the file data area, it is based on the metadata stored in the metadata area. It has a metadata recording / judgment / repair unit for specifying a file name.

In the storage device according to the present invention, the metadata backup unit may include, for each data storage unit name, type information including OS type information, file system type information, volume manager type information, and application type information, and OS area address information. , File system area address information, volume manager area address information, application area address information, and data area address information, and metadata area address data and metadata area backup data.

In addition, the program of the present invention determines whether the error occurrence address of the data lost error self-detected by the internal operation of the storage device itself is in the metadata area or the file data area. If the occurrence address is in the metadata area, the metadata area backup data of the metadata backup unit is restored to the metadata area, and if the error occurrence address is in the file data area, the metadata stored in the metadata area The metadata recording / judgment / restoration unit that specifies the file name based on the above is operated as a service program loaded into the control unit of the storage device when the OS is started.

The first effect is that when a data lost error in a partial area is detected by an internal operation of the storage device, it is possible to detect that the data has been lost without accessing the data lost area by the computer. .

The second effect is that it is not necessary to restore all data in the storage device in which the data lost error has occurred from the backup file.

A third effect is that it is not necessary to read out all the files stored in the storage device from the computer in order to identify the file in which the data lost error has occurred.

The fourth effect is that the metadata in the metadata area can be restored even when the data lost area is a metadata area such as an OS area, a file system area, or a volume manager area.

The fifth effect is that the application program, the file system manager, and the volume manager each update the service program when the OS has a service program that determines management information used by the application program, file system manager, volume manager, and the like. The service program loads the metadata recording / judgment / restoration unit into the control unit of the storage device when the OS is started, so that it is not necessary to be aware of the update of the metadata area in the storage device, When a new application program or the like is used, it is not necessary to update the metadata area in the storage device for determining each management information.

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

FIG. 1 is a block diagram showing the configuration of the metadata restoration method according to the first embodiment of the present invention. In the metadata restoration method according to the first embodiment, a storage device 9 is connected to a computer 1 via a data transmission / reception interface 8 and its main part is configured.

An OS 2 is installed in the computer 1, and an application program 3, a file system manager 4, a volume manager 5, a service program (also called a daemon) 7 and a data transmission / reception unit 6 are operating on the OS 2.

The storage device 9 is, for example, an optical disk device such as a magnetic disk device, a disk array device, a magnetic tape device, a CD (Compact Disk), a DVD (Digital Video Disk), etc., and a storage device control program 11 and metadata recording / determination / A control unit 10 having a restoration unit 15, an internal data bus 12, one or more data storage units 13 connected to the internal data bus 12, and a metadata backup unit 14 connected to the internal data bus 12 are provided. doing.

The file system manager 4 creates a file system in the file data area of the data storage unit 13 of the storage device 9 and manages where and what files are in the storage device 9.

The volume manager 5 is a disk management tool that physically groups a plurality of data storage units 13 to form one logical disk.

The service program 7 communicates with the control unit 10 of the storage device 9 via the data transmission / reception unit 6 and the data transmission / reception interface 8. Further, the service program 7 notifies the OS 2 on the computer 1 of the file data area information or file name in which the data lost error has occurred.

The control unit 10 includes a storage device control program 11 stored in a built-in storage medium, and a metadata recording / judgment / restoration unit 15 downloaded from the computer 1 by the service program 7.

The control unit 10 records / reproduces data to / from the data storage unit 13 in accordance with a data write / read command from the computer 1 during normal operation. Further, the control unit 10 communicates with the service program 7 installed in the computer 1 when the computer 1 writes metadata such as the OS format, and the OS 2, the volume manager 5, the file system manager 4, the application of the computer 1 Metadata such as information on the type of the program 3 (type information) and address information on the used area of the data storage unit 13 is recorded in the metadata backup unit 14.

The control unit 10 also has a function for operating the device itself, such as RAID restoration, for the data storage unit 13. If the control unit 10 detects a data lost error during this operation, the metadata recording / judgment / repair unit 15 causes the data lost error error occurrence address in the data storage unit 13 and the metadata read out from the metadata backup unit 14. Based on the data area address information C1, it is determined whether the error occurrence address is in the metadata area or the file data area. When the error occurrence address is in the file data area, the metadata recording / judgment / restoration unit 15 identifies the file name and sends the identified file name from the control unit 10 via the data transmission / reception interface 8 and the data transmission / reception unit 6. The service program 7 of the computer 1 is notified. When the error occurrence address is in the metadata area, the metadata recording / judgment / restoration unit 15 writes the metadata area backup data of the metadata backup unit 14 back to the metadata area of the data storage unit 13 to rewrite the data storage unit. 13 repairs the metadata.

Referring to FIG. 2A, the data storage unit 13 includes a metadata area and a file data area. The metadata area further includes a file system area including an OS area, a directory area, and a file system management area. A volume manager area, an application area composed of a raw file management area and an application management area, and a data area address area. The file system area is an area when a file system is created and used in the file data area, and the raw file area is when the file system is used without creating a file system. It is an area.

Referring to FIG. 2B, the directory area stores a plurality of sets of file names and file data addresses as directory data. Information indicating how many bytes to how many bytes of the directory data and how many bytes to how many bytes of the file data address are stored is called directory data structure information. The directory data structure information is different for each type of OS 2, and when the service program 7 loads the metadata recording / determination / repair unit 15 into the control unit 10 of the storage device 9, the metadata recording / determination / It is assumed that it is included in the restoration unit 15.

Referring to FIG. 3, the type information B1, the metadata area address information C1, and the metadata area backup data D1 are not normally accessible from the computer 1 to the metadata backup section 14 for each data storage section name. The area is compressed and recorded.

The type information B1 includes OS type information B11, file system type information B12, volume manager type information B13, and application type information B14.

The metadata area address information C1 includes OS area address information C11, file system area address information C12, volume manager area address information C13, application area address information C14, and data area address information C15. These address information C11 to C15 are address information for specifying that the data storage unit 13 is used in the OS area, file system area, volume manager area, application area, and data area.

The metadata area backup data D1 is a backup of the metadata recorded in the metadata area of the data storage unit 13.

Referring to FIG. 4, the operation at the time of writing metadata in the metadata restoration method according to the first embodiment includes a metadata writing step A1, a notification step A2 to the control unit, and a recording step A3 to the metadata backup unit. Consists of.

Referring to FIG. 5, the operations upon receiving a write command or a read command in the metadata restoration method according to the first embodiment are a write command / read command reception step A11, a write / read execution step A12, and a write command determination step A13. Read data return step A14, metadata area update step A15, metadata area update content notification step A16, metadata area backup data recording step A17, and write completion notification step A18.

Referring to FIGS. 6 and 7, the operations during the internal operation of the metadata restoration method according to the first embodiment are as follows: internal operation A21, data lost error detection step A22, data lost error detection / error occurrence address notification Step A23, step A24 for reading from the metadata backup unit, step A25 for comparing with the error occurrence address, step A26 for determining the presence or absence of an error occurrence address, step A27 for determining the file data area, step A28 for reading the file system type information , File system usage determination step A29, file system area error step A30, directory area reading step A31, error occurrence address comparison step A32, error occurrence address presence / absence determination step A33, File name identification step A34, service program notification step A35, OS notification step A36, metadata region determination step A37, metadata region backup data read step A38, metadata repair step A39, raw It comprises a file area error step A40, a raw file directory area reading step A41, an error occurrence address comparison step A42, an error occurrence address presence / absence determination step A43, and a raw file name specifying step A44.

Next, the operation of the metadata restoration method according to the first embodiment configured as described above will be described with reference to FIGS.

When the OS 2 of the computer 1 is activated, the service program 7 is automatically activated as a service before the application program 3 is activated.

After startup, the service program 7 loads the metadata recording / judgment / restoration unit 15 including the directory data structure information into the control unit 10 of the storage device 9 via the data transmission / reception unit 6 and the data transmission / reception interface 8.

Data (transmission data) written from the application program 3 operating on the OS 2 of the computer 1 is transmitted to the storage device 9 via the file system manager 4, the volume manager 5, the data transmission / reception unit 6 and the data transmission / reception interface 8 to be controlled. The data is written into the file data area of the data storage unit 13 via the unit 10 and the internal data bus 12.

Data (received data) read from the storage device 9 by the application program 3 operating on the OS 2 of the computer 1 is transmitted from the data storage unit 13 to the computer 1 via the internal data bus 12, the control unit 10 and the data transmission / reception interface 8. The data is transmitted to the application program 3 via the data transmission / reception unit 6, the volume manager 5 and the file system manager 4.

Usually, during a data write operation or a read operation from the application program 3 to the storage device 9, a data lost error occurs due to a defect in a part of the storage area of the data storage unit 13, and the write operation or the read operation is performed. In the case of abnormal termination, the volume manager 5, the file system manager 4 and the application program 3 can detect the error occurrence address of the data lost error in the data storage unit 13.

However, a defect that cannot be repaired by the data detected by the storage device 9 itself with respect to the data storage unit 13 (for example, a repair operation using RAID or a detection operation of a defective area within the data storage unit 13). The data lost area, which is an area, cannot detect in which area of the data storage unit 13 the data lost error has occurred unless the computer 1 performs a write operation or a read operation on the data lost area.

When the error occurrence address of the data lost error is in the metadata area of the data storage unit 13, the OS 2 cannot recognize the file, file system, or volume.

As shown in FIGS. 6 and 7, the operation of the metadata restoration method according to the first embodiment detects a data lost error and an error occurrence address even if the computer 1 does not access the data lost area, and further generates an error. Even if the address is in the metadata area, the data can be restored, which is different from the conventional one.

First, when the volume manager 5 operating on the OS 2 of the computer 1 creates a volume in the data storage unit 13 of the storage device 9 (step A1), the storage device control program operating on the control unit 10 11 creates a volume in the file data area of the data storage unit 13 and creates a volume manager area in the metadata area of the data storage unit 13.

At the same time, the service program 7 operating on the OS 2 of the computer 1 notifies the type information of the volume manager 5 to the control unit 10 of the storage device 9 via the data transmission / reception unit 6 and the data transmission / reception interface 8 (step). A2).

The metadata recording / judgment / restoration unit 15 records the type information of the volume manager 5 as the volume manager type information B13 in the metadata backup unit 14 and addresses information about the volume manager area of the data storage unit 13 to the volume manager area address. Information C13 is recorded in the metadata backup unit 14 (step A3).

When the file system manager 4 operating on the OS 2 of the computer 1 creates a file system for the data storage unit 13 of the storage device 9 (step A1), the storage device operating on the control unit 10 The control program 11 creates a file system in the file data area of the data storage unit 13 and creates a file system area in the metadata area of the data storage unit 13.

At the same time, the service program 7 running on the OS 2 of the computer 1 notifies the type information of the file system manager 4 to the control unit 10 of the storage device 9 via the data transmission / reception unit 6 and the data transmission / reception interface 8 ( Step A2).

The metadata recording / judgment / restoration unit 15 records the type information of the file system manager 4 in the metadata backup unit 14 as file system type information B12, and also stores address information related to the file system area of the data storage unit 13 in the file system area. The address information C12 is recorded in the metadata backup unit 14 (step A3).

Further, at the time of volume creation (step A1) and file system creation (step A1), the storage device control program 11 operating on the control unit 10 stores the OS area in the metadata area of the data storage unit 13. Create

At the same time, the service program 7 running on the OS 2 of the computer 1 reads the type information of the OS 2 and notifies the control unit 10 of the storage device 9 via the data transmission / reception unit 6 and the data transmission / reception interface 8 (steps). A2).

The metadata recording / judgment / restoration unit 15 records the OS2 type information as the OS type information B11 in the metadata backup unit 14 and the address information related to the OS area of the data storage unit 13 as the OS area address information C11. It records in the backup part 14 (step A3).

When the application program 3 operating on the OS 2 of the computer 1 performs a file write operation or read operation on the storage device 9, the storage device control program 11 operating on the control unit 10 writes When a command or a read command is received (step A11), writing or reading is executed on the file data area of the data storage unit 13 (step A12).

Next, the storage device control program 11 determines whether or not it is a write command (step A13). If it is not a write command (if it is a read command), read data is transferred from the control unit 10 via the data transmission / reception interface 8. To the computer 1 (step A14).

In the computer 1, the read data received by the data receiving unit 6 is passed to the application program 3.

If the command is a write command in step A13, the storage device control program 11 updates the metadata area of the data storage unit 13 using the information write address of the file written in the data storage unit 13 (step A15), and the metadata The update contents of the area are notified to the metadata recording / judgment / restoration unit 15 (step A16).

The metadata recording / judgment / restoration unit 15 records metadata area backup data (step A17).

Finally, the storage device control program 11 notifies the computer 1 of the completion of writing from the control unit 10 via the data transmission / reception interface 8 (step A18).

In the computer 1, the write completion notification received by the data receiving unit 6 is passed to the application program 3.

When the storage device control program 11 of the control unit 10 detects a data lost error with respect to the data storage unit 13 during the internal operation of the storage device 9 such as RAID repair (step A21), for example, the data The lost error detection and the error occurrence address are notified to the metadata recording / judgment / restoration unit 15 (step A23).

When the metadata recording / judgment / restoration unit 15 receives data lost error detection and notification of an error occurrence address, the metadata backup unit 14 sends OS area address information C11, file system area address information C12, and volume manager area address information C13. The application area address information C14 is read (step A24) and compared with the error occurrence address (step A25). The area type is determined by determining whether or not there is an error occurrence address in the read address information of each area (step A26). If it is found, it is determined that the error occurrence address is in the metadata area (step A37). If not found, it is determined that the error occurrence address is in the file data area (step A27).

If it is determined that the error occurrence address is in the file data area (step A27), the metadata recording / determination / restoration unit 15 further reads the file system type information B12 of the metadata backup unit 14 (step A28), and the file It is determined whether or not the system is used (step A29).

When the error occurrence address is in the file data area and the file system area is using the file system (step A30), the metadata recording / judgment / restoration unit 15 uses the file system in the metadata area of the data storage unit 13. The directory area of the area is read (step A31), and the file data address of the directory data and the error occurrence address are sequentially compared using the directory data structure information in the metadata recording / judgment / restoration unit 15 (steps A32 and A33). The file name is specified by specifying the file data address (step A34).

When the error occurrence address is in the file data area and the raw file area does not use the file system (step A40), the metadata recording / judgment / restoration unit 15 uses the application area in the metadata area of the data storage unit 13. The raw file management area is read (step A41), and the file data address of the raw file directory data and the error occurrence address are sequentially compared using the directory data structure information in the metadata recording / judgment / recovery unit 15 (step A41). A42 and A43), the raw file name is specified by specifying the file data address (step A44).

Next, the metadata recording / judgment / repair unit 15 sends the file name (including the raw file name) of the file in which the data lost error has occurred or the metadata area information in which the data lost error has occurred to the control unit 10, data transmission / reception The service program 7 operating on the OS 2 of the computer 1 is notified via the interface 8 and the data transmitting / receiving unit 6 (step A35).

The service program 7 notifies the OS 2 of the file name or metadata area information (step A36).

On the other hand, in the area type determination (step A26), when it is determined that the error occurrence address is in the metadata area (step A37), the metadata recording / determination / restoration unit 15 performs the metadata area backup of the metadata backup unit 14. The data D1 is read (step A38), and the metadata is restored by writing it in the metadata area of the data storage unit 13 (step A39).

Thereafter, the metadata recording / judgment / restoration unit 15 sends the file name (including the raw file name) of the file in which the data lost error has occurred or the metadata area information in which the data lost error has occurred to the control unit 10 and data transmission / reception. The service program 7 operating on the OS 2 of the computer 1 is notified via the interface 8 and the data transmitting / receiving unit 6 (step A35).

The service program 7 notifies the OS 2 of the file name or metadata area information (step A36).

As described above, the information indicating where the file data is written in the data storage unit 13 is in the metadata area, and when the information written in the metadata area is lost, the file data is written where. However, if data in the metadata area is lost by backing up the data written in the metadata area (metadata area backup data D1), the data is restored from the backup. This can be avoided. In general, since the metadata area is a small area compared to the file data area, it is more efficient than backing up the entire data storage unit 13.

FIG. 8 is a block diagram illustrating the configuration of the metadata restoration method according to the second embodiment of the present invention. The metadata restoration method according to the second embodiment is different only in that the service program 7 is added to the computer 1 of the metadata restoration method according to the first embodiment shown in FIG. Accordingly, other parts not specifically mentioned are denoted by the same reference numerals, and detailed description thereof is omitted.

The service program 7 is read into the computer 1 and controls the operation of the computer 1 in the same manner as the operation of the computer 1 in the first embodiment. Therefore, the detailed explanation is omitted.

It is a block diagram which shows the structure of the metadata restoration system which concerns on Example 1 of this invention. (A) is a figure explaining the structure of the data memory | storage part in FIG. 1 in detail, (b) is a figure explaining the content of a directory area | region in detail. It is a figure explaining the structure of the metadata backup part in FIG. 1 in detail. 6 is a flowchart illustrating an operation at the time of writing metadata in the metadata restoration method according to the first embodiment. 6 is a flowchart illustrating an operation when a write command or a read command is received in the metadata restoration method according to the first embodiment. 7 is a flowchart illustrating an operation during an internal operation of the metadata restoration method according to the first embodiment. 7 is a flowchart illustrating an operation during an internal operation of the metadata restoration method according to the first embodiment. It is a block diagram which shows the structure of the metadata restoration system which concerns on Example 2 of this invention.

Explanation of symbols

1 Computer 2 Operating System (OS)
3 Application program 4 File system manager 5 Volume manager 6 Data transmission / reception unit 7 Service program 8 Data transmission / reception interface 9 Storage device 10 Control unit 11 Storage device control program 12 Internal data bus 13 Data storage unit 14 Metadata backup unit 15 Metadata recording / recording Determination / restoration unit A1 Metadata writing step A2 Control unit notification step A3 Metadata backup unit recording step A11 Write command / read command reception step A12 Write / read execution step A13 Write command determination step A14 Read data return step A15 Metadata area update step A16 Metadata area update content notification step A17 Metadata area backup data recording Step A18 Write completion notification step A21 Device internal operation step A22 Data lost error detection step A23 Data lost error detection / error occurrence address notification step A24 Reading from the metadata backup unit A25 Comparison with error occurrence address A26 Error occurrence address presence / absence Judgment Step A27 File Data Area Judgment Step A28 File System Type Information Reading Step A29 File System Usage Judgment Step A30 File System Area Error Step A31 Directory Area Reading Step A32 Error Occurrence Address Comparison Step A33 Error Occurrence Address Presence Determination Step A34 File Name Specification Step A35 Notification to service program Step A36 To OS Notification step A37 Metadata area determination step A38 Metadata area backup data read step A39 Metadata restoration step A40 raw file area error step A41 raw file directory area reading step A42 Error occurrence address comparison step A43 Error occurrence address existence determination step A44 raw file name identification step B1 type information B11 OS type information B12 file system type information B13 volume manager type information B14 application type information C1 metadata area address information C11 OS area address information C12 file system area address information C13 volume manager area address information C14 Application area address information C15 Data area Dress information D1 metadata area backup data

Claims (8)

In an information processing system in which a storage device is connected to a computer via a data transmission / reception interface,
The storage device includes a data storage unit including a metadata area and a file data area, a metadata backup unit that backs up metadata in the metadata area, and an application program operating on the OS of the computer. When a write command and a read command are received, the file data area and the metadata area are updated by writing to and reading from the data storage unit, and the updated contents of the metadata area are recorded in the metadata backup unit. Determine whether the error occurrence address of the data lost error detected by the storage device control program and the internal operation of the storage device itself is in the metadata area or the file data area, and the error occurrence address is in the metadata area If there is, the metadata area backup data of the metadata backup unit is restored to the metadata area, and the metadata area information in which the data lost error has occurred is notified to the service program running on the computer OS, and an error has occurred. A metadata recording / judgment / repair unit that identifies a file name of a file in which a data lost error has occurred and notifies the service program based on the metadata stored in the metadata area if the address is in the file data area; With
A metadata restoration method, wherein the computer includes a service program that loads the metadata recording / judgment / repair unit to a control unit of the storage device when an OS is started. In an information processing system in which a storage device is connected to a computer via a data transmission / reception interface,
The storage device includes a data storage unit including a metadata area and a file data area, a metadata backup unit that backs up metadata in the metadata area, and an application program operating on the OS of the computer. When a write command and a read command are received, the file data area and the metadata area are updated by writing to and reading from the data storage unit, and the updated contents of the metadata area are recorded in the metadata backup unit. Determine whether the error occurrence address of the data lost error detected by the storage device control program and the internal operation of the storage device itself is in the metadata area or the file data area, and the error occurrence address is in the metadata area If there is, the metadata area backup data of the metadata backup unit is restored to the metadata area, and the metadata area information in which the data lost error has occurred is notified to the service program running on the computer OS, and an error has occurred. A metadata recording / judgment / repair unit that identifies a file name of a file in which a data lost error has occurred and notifies the service program based on the metadata stored in the metadata area if the address is in the file data area; With
The computer includes an application program, a file system manager that creates a file system in the file data area of the data storage unit, a volume manager that creates a volume for the data storage unit, and the metadata recording when the OS is started up A metadata restoration system comprising: a service program that loads a judgment / repair unit to the control unit of the storage device; and a data transmission / reception unit that transmits / receives data to / from the storage device. The metadata backup unit includes, for each data storage unit name, type information including OS type information, file system type information, volume manager type information and application type information, OS area address information, file system area address information, volume manager. 3. The metadata restoration method according to claim 1, comprising metadata area address information including area address information, application area address information, and data area address information, and metadata area backup data. In a metadata restoration method for an information processing system in which a storage device is connected to a computer via a data transmission / reception interface,
A service program operating on the computer OS loads the metadata recording / judgment / repair unit into the control unit of the storage device when the computer OS is started;
When a write command and a read command for the storage device are received from an application program running on the OS of the computer, the storage device control program of the control unit writes to and reads from the data storage unit to create a file data area And updating the metadata area and recording the updated contents of the metadata area in the metadata backup unit;
When the storage device control program detects a data lost error during the internal operation of the storage device, the step of notifying the metadata recording / determination / repair unit of the data lost error detection and the error occurrence address;
A step in which the metadata recording / determination / repair unit determines whether the error occurrence address is in the metadata area or the file data area;
When the error occurrence address is in the file data area, the metadata recording / judgment / repair unit identifies the file name of the file in which the data lost error has occurred, and
When the error occurrence address is in the metadata area, the metadata recording / judgment / repair unit writes the metadata area backup data of the metadata backup unit back to the metadata area of the data storage unit, and the metadata is stored in the data storage unit. The process of repairing,
A step in which the metadata recording / judgment / repair unit notifies the service program of the file name or metadata area information in which a data lost error has occurred;
And a service program notifying the OS of a file name or metadata area information. In a metadata restoration method for an information processing system in which a storage device is connected to a computer via a data transmission / reception interface,
A service program operating on the computer OS loads the metadata recording / judgment / repair unit into the control unit of the storage device when the computer OS is started;
When creating a volume for a data storage unit of a storage device by a volume manager operating on the OS of the computer, a storage device control program operating on the control unit creates a volume by the data storage unit, and a metadata area Creating a volume manager area, recording volume manager type information in the metadata backup unit, and recording volume manager area address information of the data storage unit in the metadata backup unit;
When creating a file system for the data storage unit of the storage device by the file system manager running on the computer OS, the storage device control program creates a file system in the file data area of the data storage unit and stores it in the metadata area. Creating a file system area, recording file system type information in the metadata backup unit, and recording file system area address information of the data storage unit in the metadata backup unit;
The storage device control program creating an OS area in the metadata area of the data storage unit when creating the volume and creating the file system;
A process in which the service program reads the OS type information and notifies the control unit of the storage device;
A metadata recording / judgment / repair unit that records OS type information in the metadata backup unit and records file system area address information in the data storage unit in the metadata backup unit;
When a write command and a read command for the storage device are received from an application program running on the OS of the computer, the storage device control program writes to and reads from the data storage unit, and a file data area and metadata Updating the area and recording the updated contents of the metadata area in the metadata backup unit;
When the storage device control program detects a data lost error during the internal operation of the storage device, the step of notifying the metadata recording / determination / repair unit of the data lost error detection and the error occurrence address;
The metadata recording / judgment / restoration unit determines whether the error occurrence address is in the metadata area or the file data area based on the error occurrence address and the type information and metadata area address information read from the metadata backup part. And a process of
If the error occurrence address is in the file data area, the metadata recording / judgment / repair unit identifies the file name, and
When the error occurrence address is in the metadata area, the metadata recording / judgment / repair unit writes the metadata area backup data of the metadata backup unit back to the metadata area of the data storage unit, and the metadata is stored in the data storage unit. The process of repairing,
A step in which the metadata recording / judgment / repair unit notifies the service program of the file name or metadata area information in which a data lost error has occurred;
And a service program notifying the OS of a file name or metadata area information. A data storage unit comprising a metadata area and a file data area;
A metadata backup unit that backs up metadata in the metadata area;
When a write command and a read command for the storage device are received from an application program running on the OS of the computer, the file data area and the metadata area are updated by writing to and reading from the data storage unit A storage device control program for recording the updated contents of the metadata area in the metadata backup unit;
It is determined whether the error occurrence address of the data lost error detected by the internal operation of the storage device itself is in the metadata area or the file data area, and if the error occurrence address is in the metadata area, the metadata Metadata record for restoring the metadata area backup data to the metadata area and specifying the file name based on the metadata stored in the metadata area if the error occurrence address is in the file data area A storage device comprising a determination / repair unit. The metadata backup unit includes, for each data storage unit name, type information including OS type information, file system type information, volume manager type information and application type information, OS area address information, file system area address information, volume manager. 7. The metadata restoration method according to claim 6, comprising metadata area address information including area address information, application area address information, and data area address information, and metadata area backup data. The computer determines whether the error occurrence address of the data lost error detected by the internal operation of the storage device itself is in the metadata area or the file data area, and if the error occurrence address is in the metadata area, the metadata Metadata area of the backup unit Restores the backup data to the metadata area, and if the error occurrence address is in the file data area, the metadata recording / determination that identifies the file name based on the metadata stored in the metadata area A program for operating the restoration unit as a service program that is loaded into the control unit of the storage device when the OS is started.

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