Abstract
Solid-state drive (SSD) with flash memory as the storage medium are being widely used in various data storage systems. SSD data compression means that data is compressed before it is written to Not-And (NAND) Flash. Data compression can reduce the amount of data written in NAND Flash and improve the performance and reliability of SSDs. At present, the main problem facing data compression of SSD is how to improve the efficiency of data compression and decompression. In order to improve the performance of data compression and decompression, this study proposes a method of SSD data deduplication based on zone division. First, this study divides the storage space of the SSD into zones and divides them into one hot zone and multiple cold zones according to the different erasing frequency. Second, the data in each zone is divided into hot data and cold data according to the number of erasures. At the same time, the address mapping table in the hot zone is loaded into the cache. Finally, when there is a write or read request, the SSD will selectively compress or decompress the data according to the type of different zones. Through simulation tests, the correctness and effectiveness of this study are verified. The research results show that the data compression rate of this research result can reach 70–95%. Compared with SSD without data compression, write amplification is reduced by 5 to 30%, and write latency is reduced by 5 to 25%. The research results have certain reference value for improving the performance and reliability of SSD.
Highlights
Solid-state drive (SSD) with flash memory as the storage medium are replacing HHD as the main storage device.Compared with HDD, SSD has fast read and write speed, good shock resistance and low power consumption [1]
In order to improve the SSD data compression performance, this study proposes an SSD data compression method based on the zone of flash memory (ZDC)
In order to reduce SSD data writing, reduce SSD write amplification, and improve SSD reliability, this study designed a method of SSD data compression based on block partition
Summary
SSDs with flash memory as the storage medium are replacing HHD as the main storage device. Compared with HDD, SSD has fast read and write speed, good shock resistance and low power consumption [1]. Flash memory can be divided into four levels: target, logical unit (LUN), block, and page [2]. A block is the basic unit of data erasure, and a page is the basic unit of read and write operations in flash memory [3]. When data are updated on a page, the block where the page is located must be erased before data can be updated on the page. When the data of a certain page need to be updated, the SSD writes the new data to a new page first and marks the original page as invalid
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