Full flash memory system based on ZNS solid state disk and address mapping method

Abstract

The invention provides a full flash memory system based on a ZNS solid state disk and an address mapping method, the system comprises at least one ZNS solid state disk, and the physical storage space of the at least one ZNS solid state disk comprises a mapping area and a data area; wherein the mapping area is used for storing an object FTL mapping table; the object FTL mapping table is used for establishing a mapping relation between the target object and the corresponding physical address; the target object comprises any storage system operation unit constructed on the full flash memory system; the data area is virtualized into a continuous storage address space and is used for storing data. According to the full flash memory system based on the ZNS solid state disk and the address mapping method provided by the embodiment of the invention, the problem of multi-write amplification caused by the interior of the SSD, the interior of the full flash memory system and the application can be eliminated, the mapping mode based on the object can adapt to a complex scene with mixed different loads, and meanwhile, the design of the whole storage system is simplified.

Description

Technical field [0001] The present invention relates to the ZNS solid state drive field, particularly to a ZNS solid state drive based on the all-flash system and address mapping method. Background [0002] In the era of big data, the performance of traditional mechanical hard disks can not meet the needs of enterprise-level storage due to mechanical structure problems, and the solid-state hard disks with semiconductor flash memory chips as the storage medium have brought revolutionary progress to the storage system and become a substitute for traditional disks. With the enterprise storage system itself on the data capacity and throughput of the requirements are getting higher and higher, a single solid-state drive is increasingly unable to meet the needs of the current enterprise-class storage system, all-flash storage technology, especially based on disk array technology developed from the all-flash array technology, to one or more solid-state drives, to provide large capacity,...

AI Technical Summary

Problems solved by technology

Taking the all-flash array as an example, the RAID technology used is based on mechanical hard disks, without considering the characteristics of solid-state disks. The garbage collection problem caused by random writing of RAID stripes will introduce additional write amplification. It will also cause write amplification and cannot fully utilize the performance advantages of the all-flash system

In addition, the traditional block device interface reads and writes in units of logical blocks or sectors. The internal FTL mapping of enterprise-level SSDs is generally based on flash memory pages. This difference in access granularity will also cause performance loss and even aggravate the wear and tear of SSDs. Storage application logic has its own allocation, recovery algorithm and read / write unit, which will also cause performance loss

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