Block-level continuous data protection method based on solid-state disc

Abstract

The invention discloses a block-level continuous data protection method based on a solid-state disc. The block-level continuous data protection method based on the solid-state disc comprises the steps that an empty write request queue cache is built in the inner memory and used for storing write requests from a user in a buffering mode, and an inner memory space CDP_store is initialized in an FTL layer of solid-state disc and used for recording historical records CDP_entry of an FTL mapping chart, receiving the requests from the user and judging that the requests are read-write requests or recovery requests on data blocks. If the requests are the read-write requests on the data blocks, the inner memory space CDP_store judges that the requests are read requests or write requests, if the requests are write requests, whether the write request queue cache has residual cache space or not is judged, and if not, the content in the write request queue cache is written back onto the solid-state disc. The block-level continuous data protection method based on the solid-state disc combines the characteristics of the solid-state disc and utilizes the characteristics left by 'covered' historical data, generated in an internal 'non-local updating' process of the solid-state disc, in the solid-state disc, thereby achieving the function of continuous data protection based on SSD.

Description

technical field [0001] The invention belongs to the field of computer data storage and backup, and more specifically relates to a block-level continuous data protection method based on a solid-state disk. Background technique [0002] Continuous data protection technology is an effective data disaster recovery technology. It is proposed to solve the shortcomings of traditional backup technology that requires downtime for backup and large amount of data loss when disasters occur. The Storage Networking Industry Association (SNIA) defines Continuous Data Protection (CDP) as: Continuous Data Protection is a set of methods that can capture or track data changes and Stored independently of production data to ensure that data can be restored to any point in time in the past. Continuous data protection is to continuously protect the storage system without the need to stop the system specifically. It continuously tracks and saves the state changes that occur in the storage system,...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional implementation of continuous data protection technology is based on the hard disk drive (HDD for short), which has two defects

First of all, each data write operation needs to be tracked and saved, which has a continuous impact on the system, and this impact is often large

Images