Method and system for increasing available capacity and service life of solid state disc

Abstract

The invention discloses a method and system for increasing available capacity and service life of an SSD (solid state disc). The method comprises the following steps: partial space is divided from an SSD and taken as a shadow area of the SSD, and a copy hash table and a second hash table are initialized in the shadow area; a plurality of buckets are divided from an internal storage, wherein the buckets and block groups are arranged in a one-to-one correspondence manner, and are identical in quantity; the space except the space occupied by both the copy hash table and the second hash table is divided into multiple different small areas which are in one-to-one correspondence with the block groups; the distribution of a file system on the SSD is analyzed; a query tree for recording addresses of meta data blocks and data blocks is generated according to the analysis result; the request of users is received; and whether the request is a meta data block request or a data block request can be judged according to the query tree. According to the invention, the repeated delete technology is applied to the data blocks, and the Delta coding technology is applied to the meta data blocks, so that the overall written times of the SSD experiences can be reduced, and finally the available capacity of the SSD is increased, and the service life of the SSD is prolonged.

Description

technical field [0001] The invention belongs to the field of computer data storage, and more specifically relates to a method and a system for improving the effective capacity and lifespan of a solid-state disk. Background technique [0002] Due to the continuous rise of flash memory technology in the past few years, the capacity of flash-based solid state disk (SSD) has been greatly increased and its price has also been greatly reduced, making it more cost-effective than Compared with traditional HDD, it has certain competitive advantages. It is now practical to use SSDs in common application scenarios. [0003] The overall performance of SSD is better than that of mechanical disk, especially the random access performance. The seek operation of the mechanical parts inside the HDD disk is the main reason for its low performance. On the contrary, there are no mechanical parts inside the SSD, and there is no seek operation. The main overhead comes from the logical address of...

AI Technical Summary

Problems solved by technology

The magnetic head cannot access the disk in parallel. On the contrary, if the application has high concurrency, it will cause the magnetic head to keep "thrashing" and reduce performance.

[0005] While SSD has some advantages, it also has some limitations

Manufacturers have not addressed the inherent limitations inherent in SSDs well

On the contrary, as the number of bits stored in each memory cell gradually approaches the limit of semiconductor physics, the life cycle and reliability problems of SSD have become more and more prominent.

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