WO2013044726A1 - Procédé et dispositif de correction de perte d'index de données - Google Patents

Procédé et dispositif de correction de perte d'index de données Download PDF

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Publication number
WO2013044726A1
WO2013044726A1 PCT/CN2012/081176 CN2012081176W WO2013044726A1 WO 2013044726 A1 WO2013044726 A1 WO 2013044726A1 CN 2012081176 W CN2012081176 W CN 2012081176W WO 2013044726 A1 WO2013044726 A1 WO 2013044726A1
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WIPO (PCT)
Prior art keywords
data
index
backup
block space
stored
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PCT/CN2012/081176
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English (en)
Chinese (zh)
Inventor
陈晓亮
石玉清
钟超
李占军
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华为技术有限公司
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Publication of WO2013044726A1 publication Critical patent/WO2013044726A1/fr

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    • 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

Definitions

  • the present invention relates to communication technologies, and in particular, to a data recovery fault recovery method and apparatus. Background technique
  • data is typically stored on disk and the corresponding data index is stored to make it easier to find the data it needs from disk.
  • the video data is stored in the data disk, and is specifically stored in a plurality of block spaces on the data disk; the data index corresponding to the video data is stored in a system disk on which the operating system is installed; the video monitoring system is generally 7 X 24 hours of continuous operation, the system disk will be frequently read and written for a long time, which will easily cause system disk failure, resulting in data index loss.
  • the data index is lost, the user will not be able to find the recorded data on the data disk, and the recorded data on the data disk will be lost, which will cause serious system failure and cause huge loss to the user.
  • the currently used remedy for system disk failure is to take a video surveillance system as an example, read the video data on the data disk, and gradually analyze and reverse the data index according to the video data, so that the new data is replaced. After the system disk, you can restore the data index to the new system disk and continue to use it.
  • this method must traverse all the recorded data on all data disks to fully recover the data index corresponding to the data; when the amount of data on the data disk is extremely large, the recovery method may take a lot of time. Long, at the same time, during the data index recovery process, the video surveillance service cannot be started, and the service will be interrupted for a long time. Summary of the invention
  • the present invention provides a data index fault recovery method, the data index is used to identify storage location information of stored data in at least one data disk, and the data disk includes at least one block space for placing the stored data;
  • the fault recovery method includes: scanning a head reserved area of the block space, and acquiring a backup index stored in the head reserved area, where the backup index includes at least a data identifier of the stored data in the block space. And storage address information of the stored data in the block space; generating a data index, the data index including at least the backup index.
  • the present invention provides a data indexing fault recovery apparatus, including: a backup obtaining unit, configured to scan a head reserved area of a block space in a data disk, and obtain a backup index stored in the head reserved area,
  • the backup index includes at least a data identifier of the storage data in the block space and storage address information of the storage data in the block space; wherein the storage data is stored on at least one data disk, and each The data disk includes at least one block space for placing the storage data;
  • an index recovery unit configured to generate a data index that identifies storage location information of the storage data in the at least one data disk, the data index including at least the Backup index.
  • the data recovery fault recovery method and device of the present invention can quickly restore the data index according to the backup index by storing the backup index in the block space of the data disk, thereby solving the data index recovery time. Longer problems have greatly improved the speed of data index recovery. DRAWINGS
  • FIG. 1 is a schematic flowchart of an embodiment of a method for recovering a data index according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an application scenario of another method for recovering a data index according to another embodiment of the present invention
  • FIG. 3 is a schematic flowchart of another method for recovering a data index according to another embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an embodiment of a data recovery fault recovery apparatus according to the present invention.
  • the data index is used to identify the storage location of the storage data on the data disk.
  • Information where the data on the data disk can be called storage data
  • the data disk includes at least one block space for placing the stored data, and the block space is a fixed-size space pre-allocated on the data disk. Users can get the storage location of the data according to the data index, so that the required data can be quickly found.
  • the video surveillance system is taken as an example in the embodiment of the present invention, but it should be understood by those skilled in the art that the embodiments of the present invention are equally applicable to other storage systems.
  • FIG. 1 is a schematic flowchart of a method for recovering a data index according to an embodiment of the present invention. As shown in FIG. 1, the method may include:
  • each data disk and the block space may be scanned one by one in order.
  • the block space is stored in the block space, and the head reserved area is usually set in the block space, but the current utilization rate is still low, and there is still excess space; for example, the size of the block space is generally 1M. Actually, only about 20 bytes of space are actually used for placing information indicating the camera to which the block space belongs.
  • a backup index is placed in the head reserved area.
  • the backup index includes at least a data identifier of the stored data placed in the block space and storage address information of the stored data in the block space.
  • the stored data is recorded data, and the data identifier of the stored data is used to distinguish the stored data from other stored data, for example, in a block space of the data disk.
  • the backup index is generated according to the data index after storing the data and generating the data index corresponding to the data. For example, if 12 to 3 minutes and 5 seconds of video data is stored in the 11th to 28th bytes in the block space a in the data disk A, the data index corresponding to the video data generated thereby may include 12:3:5, data disk A, block space a, 1st byte (start address), 28th byte (end address), etc., and the data index indicates storage location information of video data.
  • the backup index and the data index may be the same or different; for example, the data index may be directly used as backup data; or only part of the information in the data index may be extracted as a backup index, but At least 12:3:5, the 11th byte (starting address), the 28th byte (end address) should be included; and the information of the data disk and the block space a can also be in the process of scanning the block space of the data disk. Get it in.
  • the data index can be obtained according to the backup index.
  • the backup index includes only 12 points, 3 minutes, 5 seconds, 11th byte (starting address), and 28th byte. (End address); when recovering the data index according to the recovery, in particular, in the process of scanning and obtaining the backup index, the block space identifier (block space a) of the block space where the backup index is located, and the block space can be obtained.
  • the data disk identifier of the data disk (data disk A), which belongs to the attribute information of the data disk, and is available when scanning the data disk.
  • the backup index can be directly used as the data index in the 102.
  • the data index may further include other information such as an index identification item, which is used to identify whether the index is valid, but when the 102 is executed, the index is generally considered to be valid.
  • the storage address information of the data in the block space can be obtained only by scanning all the stored data in the block space.
  • the backup index includes the data identifier of the stored data and the storage address information of the stored data in the block space, so that when the data index is restored, it is not necessary to scan all the stored data in the entire block space, only
  • the above information can be obtained by scanning the reserved area of the head where the backup cable is located, thereby greatly reducing the scanning time and improving the efficiency of data index recovery.
  • the head reserved area occupied by the backup data in the block space usually has a small space, and the data disk only pays a small space cost, but in exchange for a significant reduction in the failure recovery time, making the time efficiency in the video monitoring system And the space efficiency is well balanced.
  • this embodiment distributes the backup index in each block space of the data disk, and the backup index in the block space corresponds to the data stored in the block space, so that even if the data disk is partially damaged, If the data in a block space and its corresponding index are not damaged, the data in the block space can be restored, thereby greatly improving the security of data storage relative to the manner of centrally storing all the indexes of the entire data disk.
  • the backup index is stored in the head of each block space in a distributed manner, and the data is more secure than the manner in which the data is stored in the data disk, for example, a dedicated folder is placed to place the files. Because after a storage area in the backup index set, if there is damage or data loss, all data may not be recovered. In addition, the way of centralized storage, if you need to regularly prepare these indexes The gap may be relatively large, for example, it is difficult to perform real-time backup by backing up every hour. However, the distributed storage method of the embodiment of the present invention can greatly reduce the time gap.
  • the data index can be quickly restored according to the backup index, thereby solving the problem that the data index recovery time is long, and the data index is greatly improved. Recovery speed.
  • the data recovery of the video surveillance system is taken as an example to describe the fault recovery method of the present invention.
  • the fault recovery method of the present invention is not limited to the field of video surveillance, and can be applied to all applications requiring special protection of critical data, which can improve data security and fault recovery speed.
  • a disk ⁇ disk N represents a data disk for storing video data; an operating system and a database are installed on the system disk. And the system disk further stores a data index for searching the recorded data on the data disk; the storage server can receive the data stream of the recorded data, and store the data through the system disk to the data disk.
  • the method of this embodiment may be performed by the storage server.
  • FIG. 3 is a schematic flowchart of another embodiment of a method for recovering a data index according to the present invention. As shown in FIG. 3, the method may include:
  • the storage server puts the stored data into a block space of the data disk, and generates a data index corresponding to the stored data.
  • the stored data refers to the recorded data; the stored data is stored in blocks on the data disk, and the data disk may be configured with a plurality of block spaces, each of which has a size of 1 GB. When the recording data of a block space is full, it will automatically switch to another free block space to continue storage.
  • the data of the data is usually generated when the data is stored. index.
  • the storage server in the embodiment may simultaneously generate a corresponding data index in the system disk, and the data index may include a data identifier, storage location information of the data in the data disk, and the like.
  • FIG. 4 is a schematic diagram of another embodiment of a method for recovering data index of the present invention.
  • data disk A is provided with n block spaces, where n is stored in block space a.
  • the recording data of the second; the data index initially generated by the n seconds of recording data includes n indexes corresponding to the recording data of each second, for example, the data index of the first second recording data shown in FIG. 4,
  • the data index of the second second recorded data, etc., the n data indexes have the same format, including multiple index items, and may include, for example, time, data disk number, block space number, start address, end address, and index identifier. (i sD ⁇ my ), reserved fields, etc.
  • the time is the recording time of the recorded data, such as 12:3:5 on January 1, 2011, as the data identifier of the recorded data;
  • the storage location information may include the data disk number, the block space number, the start address, and the end address.
  • the data disk number is a data disk identifier
  • the block space number is a block space identifier on the data disk
  • the start address and the end address are physical storage addresses of the data in the block space
  • the storage location information may be It is the 11th byte to the 28th byte of the block space a on the data disk A.
  • the index identification item is an identifier for identifying whether the index is valid. For example, "1" can be set to be valid, that is, the corresponding recording data can be found by using the index, and "0" means invalid; the reserved field is used for future expansion. In the case of no use, you can first fill in 0.
  • the data disk may be stored once at a time; for example, after receiving the recorded data, the storage server may first store the data in the cache, and then pass through, for example, a buffer of 4 seconds. After that, the data in this period is uniformly stored in the data disk, and a data index is generated, and the data index may be corresponding to the data per second, for example, the data index of the first second recorded data, and the second second recorded data. Data indexing, etc.
  • the storage server obtains a backup index according to the data index, and stores the backup index in a reserved area of the head space of the block space;
  • the storage index may be obtained according to the data index, and the backup index is stored in the head reserved area of the block space.
  • the backup index is to back up the data index, and the data generated in 301 can be directly used as a backup index, or only part of the content can be selected as a backup cable); whether all backups or partial backups can be selected specifically According to the actual situation, for example, according to the code stream speed, the lower the code stream speed, the longer the time required to fill a block space. If it is necessary to record the data index corresponding to the recording data per second, then the number of data indexes. The more the block space area occupied by the data index is, and the head reserved area of the block space is certain. If the data is still backed up by the entire contents of the data index, it is possible that the block space is pre-predicted.
  • the data index in the backup index pair 301 of the embodiment is simplified, and part of the content is selected for backup; the backup index includes at least a data identifier of the stored data in the block space, and storage of the stored data in the block space.
  • Address information the storage address information including a start address and an end address stored in the block space.
  • At least the above information is included because it takes a long time to recover the data index in the prior art because the block space of the data disk needs to be completely Scanning to determine the specific physical storage address of the data in the block space, which is the main reason for time-consuming. Therefore, it is necessary to save the storage address information of the data in the block space during backup, and it is no longer needed when index recovery is performed. For the full scan of the block space; for the data disk number and the block space number, this is some attribute information recorded by the data disk itself, which can be easily obtained when scanning the data disk.
  • an index identifier item may also be included.
  • the role of the index identifier item is as follows. Assume that there is a video recording for one hour, one record is stored every second, and a total of 3,600 records, for example, 1800 of the 3,600 records are valid. Recording, if another 1800 is invalid recording, the index identification item corresponding to the valid record can be set to 1, and the index identification item corresponding to the invalid record can be set to 0; when performing backup, only the valid record, that is, the above 1800, can be backed up. At this time, the index identification item may or may not be backed up.
  • the index identification item must be restored to distinguish between the valid record and the invalid record, because If the recovery is to be restored to 3600 records, the records that are restored from the backup are valid. You need to set the index identification item for identification. In addition, the restored records are invalid, and the index identification items are also required for identification. Reserved fields are not required.
  • the occupied space of the index item "time” is also reduced.
  • “Time” occupies 8 bytes in the prior art, which belongs to a redundant design, and actually only needs 4 bytes, so
  • the occupied space of "time” is designed to be 4 bytes; the start address and the end address are consistent with the original, each occupying 4 bytes.
  • the backup index of this embodiment has a size of only 12 bytes after the above-mentioned simplification, and the occupied space is reduced by 50% compared with the prior art 24-byte data index, which greatly saves the occupied block space.
  • This embodiment stores the backup index in the header reserved area of the block space.
  • a small portion of space is reserved in the header area of each block space, which is called a head reserved area; corresponding to the block space
  • the backup index of the stored data in the storage area can be stored in the header reserved area.
  • the recorded data from the first second to the nth second is stored, and in the header reserved area of the block space a, the recorded data corresponding to the above from the first second to the nth second is stored.
  • Backup index including the first second backup index, the second second backup index ... until the nth second.
  • the space occupied by the backup index is very small. For example, according to the minimum 256Kb code stream of standard definition video, the backup index space required for 1 GB of video data is only 384 KB, which accounts for about 4/4 of the total storage capacity of the block space.
  • the backup index corresponding to the stored data is stored in the reserved area of the head space of the block space.
  • the storage server may store the data once in the block space every 4 seconds, and generate a data index and a backup index corresponding to the stored data.
  • the backup index corresponding to the data stored in the block space may be used. It is placed in the head reserved area of the block space. This can reduce the frequent operation of the data disk and extend the life of the data disk.
  • the storage server scans a head reserved area of the block space, and obtains a backup index stored in the reserved area of the header.
  • the storage server scans the header reserved area of the block space, and obtains a backup index stored in the reserved area of the header.
  • the backup index includes at least a time, a start address, and an end address.
  • the data disk number and the block space number are also required.
  • the above two index items may be obtained during the scanning process;
  • the block space number is the sequence number of the block space currently being restored, and may be from the data disk attribute information. Obtained in the block space file name;
  • the data disk number is the disk serial number currently being processed, and is incremented according to the scanning order of the disk.
  • the index identifier i sDummy can be considered to be valid when index recovery is performed, and is set to a valid identifier such as "1"; the reserved field for future expansion can be 3 bytes, which is temporarily useless. You can fill in all 0 when recovering. At this point, the backup index has been restored to the original data index, and the storage server writes the restored data index to the new system disk, which can be applied to subsequent data lookups.
  • the backup index by storing the backup index in the block space, when the index recovery is performed, only the head reserved area of all the block spaces needs to be scanned once, and the data index can be restored to the system disk, and there is no need to traverse all the data.
  • Disk data, and the backup index occupies a small amount of block space, usually only a few hundred KB, compared to the prior art full scan recovery method, the recovery time can be shortened from the previous 2 days to a few minutes;
  • the backup index takes up less space, and the scan recovery time is further shortened, which greatly saves the time required to restore the data index, reduces service interruption time, and improves data security and integrity. Add extra protection for security and disaster tolerance.
  • the backup index may be stored in a data storage space outside the reserved area of the head space of the block space, where the data storage space is The storage data corresponding to the backup index is stored, and the backup index and the corresponding storage data are encapsulated and stored.
  • the area outside the reserved area of the head is a data storage space, and the video storage space stores video data of multiple frames.
  • the embodiment is encapsulated, and the encapsulation refers to adding recovery information for restoring the part of the original data on the basis of the original data, and the original data and the recovery information are combined.
  • the storage server can scan each frame of data in the block space and obtain a backup index other than the original data in each frame, according to which the original data index can be restored.
  • frame header information, frame tail information, and data length and check information may also be set in the frame, and the above information is used to check whether the frame data is damaged; for example, it is inevitable to add a data length from the beginning of the frame. The end of the frame is obtained, otherwise the frame data can be invalidated.
  • the security of the data protection is further greatly improved, so that even if the reserved area of the block space header is damaged, as long as the stored data is not damaged, for example, the above-mentioned frame data is not damaged. , you can restore the frame data.
  • the data index in the system disk is further provided with the database shown in FIG. 2, where the database stores a statistical index for the data index, and the statistical index includes The data identification range of the stored data, and the storage location information of the data identification range in at least one data disk.
  • the recorded data of the first second to the tenth second is stored, and the first second recorded data index and the second second recorded data index are recorded in the data index of the system disk.
  • the 10 second recording is stored separately every second; however, it is recorded in the database that the recording data of the first second to the tenth second is stored in the block space a of the data disk A, and is statistical information.
  • the user searches for the recorded data of the data disk, for example, the target data searched by the user is the recorded data of the 6th second, it can first search the database, and know that the recorded data of the first second to the tenth second is stored in the block of the data disk A.
  • the data index, recorded in the data index is a detailed record of each second of the recorded data stored in the block space, from which the user can find the 6th second of the recorded data is stored in the 11th byte of the block space a to The location of the 20th byte, so the user can get the target data accordingly.
  • the statistical index data in the above database is also lost.
  • the database information can be recovered together, and the data index obtained by the recovery is counted to obtain a statistical index. Information, and store the statistical index in the database.
  • the data index can be quickly restored according to the backup index, thereby solving the problem that the data index recovery time is long, and the data index is greatly improved. Recovery speed.
  • FIG. 5 is a schematic structural diagram of an embodiment of a data recovery fault recovery apparatus according to the present invention.
  • the apparatus may be the storage server shown in FIG. 2 or one of the functional units provided in the storage server.
  • the apparatus may perform any of the present invention.
  • the apparatus may include a backup acquisition unit 51 and an index recovery unit 52.
  • the backup obtaining unit 51 is configured to scan a head reserved area of the block space in the data disk, and obtain a backup index stored in the head reserved area, where the backup index includes at least the block space.
  • the index restoring unit 52 is configured to generate a data index that identifies storage location information of the stored data in the at least one data disk, where the data index includes at least the backup index.
  • the device may further include an index generating unit 53 and an index backup unit 54.
  • the index generating unit 53 is configured to put the stored data into the block space of the data disk, and generate the data index corresponding to the stored data.
  • the index backup unit 54 is configured to obtain a backup according to the data index. Indexing, and storing the backup index in a header reserved area of the block space.
  • the index backup unit 54 is configured to store, in the header reserved area of the block space, a backup index corresponding to the stored data when the storage data is placed in each of the block spaces.
  • the index backup unit 54 is specifically configured to extract, from the data index, a data identifier corresponding to the storage data in the block space, and storage address information of the storage data in the block space as the backup index;
  • the index recovery unit 52 is configured to: obtain, by scanning a block space in the data disk, a block identifier of a block space where the backup index is located, and a data disk identifier of a data disk where the block space is located; At least the data index of the backup index, the block space identifier, and the data disk identifier is included.
  • the index backup unit 55 of the embodiment is further configured to store the backup index in a data storage outside the head reserved area of the block space after obtaining the backup index according to the data index.
  • a storage area corresponding to the backup index is stored in the data storage space; and the backup index and the corresponding storage data are encapsulated and stored.
  • the data recovery fault recovery device of the embodiment can quickly restore the data index according to the backup index by storing the backup index in the block space of the data disk, thereby solving the problem that the data index recovery time is long, and the data index is greatly improved. Recovery speed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the components displayed by the unit may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), A medium that can store program codes, such as random access memory (RAM, Random Acce ss Memory), disk, or optical disk.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the steps of the foregoing method embodiments are included; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

L'invention concerne un procédé et un dispositif de correction de perte d'index de données, le procédé consistant à : explorer la région réservée au surdébit d'un espace de blocs pour obtenir un index de secours stocké dans la région réservée au surdébit, l'index de secours comprenant au moins un identificateur de données des données stockées dans l'espace de blocs et les informations d'adresse de stockage des données stockées dans l'espace de blocs ; et générer un index de données, l'index de données comprenant au moins l'index de secours. En stockant l'index de secours dans l'espace de blocs d'un disque de données, le procédé et le dispositif de correction de perte d'index de données de la présente invention permettent de récupérer rapidement les index de données d'après l'index de secours, et résolvent le problème de la longueur du temps nécessaire à la récupération des index de données, ce qui améliore grandement la vitesse de récupération des index de données.
PCT/CN2012/081176 2011-09-28 2012-09-10 Procédé et dispositif de correction de perte d'index de données WO2013044726A1 (fr)

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