Continuous time data protection method on solid state drive

Abstract

The invention relates to the field of solid state drive storage, and provides a continuous time data protection method on a solid state drive. The continuous time data protection method on the solid state drive comprises the following steps: in a write process of a drive, adding timestamp information in a page mapping table of an FTL (Flash translation layer); writing a time point which needs to be recovered into NOR FLASH; recovering the backup of the mapping table from NAND FLASH; determining a recovery time point of the NOR FLASH; according to the recovery time point of the NOR FLASH, sorting data blocks in the FLASH; carrying out jump scanning on the physical pages of data in the sorted data blocks to obtain data writing time; and comparing a relationship among the timestamp in the mapping table, the writing time in the data page and the recovery time point to revise the mapping table to obtain the integral mapping information of the recovery time. The method realizes data protection on an aspect of continuous time, overcomes the imperfection of the data protection of a single time point and greatly lowers influence on the normal read and write of drive data.

Description

technical field [0001] The invention relates to the storage field of solid-state hard disks, in particular to a continuous-time data protection method on solid-state hard disks. Background technique [0002] Storage devices often face various risks, including: hardware obstacles, virus intrusion, malicious attacks, accidental errors, and so on. In order to better protect data, it is necessary to establish a robust storage system. Backups, snapshots and CDP (Continuous Data Protection) are data protection techniques commonly used by many researchers. Backup and snapshots regularly save a certain number of versions of the hard disk image. In theory, CDP can provide any number of versions, and the application range is wider. With the wider application of solid-state drives, the application of data protection technology on solid-state drives has also emerged slowly, most of which are backups of hard drive data at specific points in time. At present, most of the existing data...

AI Technical Summary

Problems solved by technology

At present, most of the existing data protection methods based on solid state disks are to regularly save the hard disk data at a certain point in time at a set time interval. When the user finds an error, it can only be restored to a specific time point. The protection of the data is not perfect, and the data cannot be recovered at continuous points in time

In addition, the existing data recovery methods that can be applied to continuous time points on solid-state hard disks occupy a large amount of memory space to record each change of mapping information in FTL, which will also increase the extra operating time of the hard disk, and excessively affect the hard disk. The normal reading and writing, and the change of recorded data in the prior art will cause the problem of excessive memory usage

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