Method for realizing intelligent degradation of data cached in SSD (Solid State Disk) of storage system

Abstract

The invention discloses a method for realizing intelligent degradation of data cached in an SSD (Solid State Disk) of a storage system. The method comprises the following steps: identifying and counting the degradation characteristic attributes of cached data by adopting a set of intelligent cached data degrading strategy and using an intelligent cached data degrading thread; when a degradation condition is satisfied, actively completing degrading operation of the cached data according to an intelligent degradation algorithm, and transferring data blocks needing to be degraded from an SSD cache into an HDD (Hard Disk Drive), thereby realizing active degradation of the cached data, lowering the cache poisoning and effectively using an SSD cache space. By adopting the method, the cache poisoning can be lowered greatly, data in the cache are hottest data, efficient utilization of the SSD cache space is ensured, the throughput of the storage system is increased, the response time is shortened, and the performance of the storage system is improved integrally.

Description

technical field [0001] The invention relates to a method for intelligently degrading data in an SSD cache of a storage system, which is usually used in a storage system and aims to provide a method for intelligently degrading data in an SSD cache. technical background [0002] With the progress of today's society, more and more data information needs to be processed, and the amount of data is growing explosively. This brings many problems to the traditional storage system. Traditional storage systems generally use mechanical hard disks (HDDs), and the performance of traditional storage systems has become a bottleneck. In the past two years, SSD, that is, solid-state storage hard disk, has begun to rise. On the one hand, SSD itself has the characteristics of fast random access, low power consumption, ultra-light and ultra-thin, and low failure rate (non-mechanical components). On the other hand, due to technological development, SSD has gradually solved the problem of smal...

AI Technical Summary

Problems solved by technology

One is to solve the pollution problem of the SSD cache, how to reduce the outdated data in the cache, and reduce the degree of cache pollution, so as to improve the effective utilization of the limited SSD space and cache the most valuable data; the other is to solve the performance brought by the passive downgrade strategy The question is, how to adopt an effective strategy, turn passive into active and separate the dependence of downgrade operation on upgrade operation, solve the problem of SSD read and write characteristics, and improve the overall performance of the cache

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