A method for delayed generation of a check disc and its corresponding data recovery method

Abstract

The invention belongs to the technical field of checking and discloses a parity disk delayed generation method and a corresponding data recovery method. The parity disk delayed generation method includes: only after data distributed to data disks are already stored in data buffers and data disk image files corresponding to the data disks are created, subjecting the data disk image files to block level itemization, performing check computation item by item to generate parity disk image files corresponding to the data disk image files, and finally performing one-time recording of the parity diskimage files in parity disks. The corresponding data recovery method includes: reading data of the parity disks to perform recovery data computation item by item to obtain the block level items, writing into the image files to obtain recovery image files after the size of the image files reach disk physical capacity. By buffering through cache data, delayed generation of the parity disks is realized, adaptability to characteristics of once writing and repeated reading of the disks is realized, and writing performance of the data disks can be improved.

Description

technical field

[0001] The invention belongs to the technical field of verification, and more specifically relates to a method for delaying generation of a verification disc and a corresponding data recovery method. Background technique

[0002] Due to the advantages of optical discs in terms of long-term preservation and energy consumption, large-capacity optical disc libraries utilize optical disc storage media to store cold data. The large-capacity optical disc library can accommodate tens of thousands of Blu-ray discs in a single cabinet. According to the physical storage conditions of the optical disc library and the number of optical drives, these discs are divided into a series of disc groups with a fixed number of discs, such as figure 1 shown. In order to ensure the reliability of the data and ensure that the data is not lost when partial data fails or a single optical disc is unreadable, it is necessary to generate verification data inside the optical disc group. ...

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