Solid-state disc array garbage collecting method

Abstract

A solid-state disc array garbage collecting method relates to a computer data storage method. A re-direction data mapping table and four function modules are arranged on a solid-state disc array. The four function modules comprise a main control module, a garbage collection control module, a re-direction requesting module and a data collection module. The method includes an initialization step, a garbage collection stage, a data collection stage, a finishing step and the like. When a certain solid-state disc which is processing garbage collection operation receives a user read-write request, the read-write request is re-directed onto other member solid-state discs in the solid-state disc array, and read data is obtained through a reconstitution read mechanism. A write request is re-directed in a hot standby disc, namely data is written into the hot standby disc, and simultaneously corresponding verifying information is updated. After garbage collection operation is finished, the write data re-directed on the hot standby disc is collected on the correct position on the solid-state disc array. Fluctuation effects of garbage collection operation on solid-state disc array system performance are reduced, and the performance of the solid-state disc array is improved.

Description

technical field [0001] The invention relates to a computer data storage method, in particular to a garbage collection method of a solid state disk array. Background technique [0002] As a mainstream storage medium, disk has been widely used in personal computers and enterprise-level data storage and other fields, but its mechanical characteristics limit the rapid improvement of its read and write performance. ". At present, flash-based solid-state disks have become a powerful alternative to magnetic disks and have received extensive attention from academia and industry. Compared with magnetic disks, flash-based solid-state disks are semiconductor storage media with no mechanical parts. They have the advantages of durability, shock and drop resistance, no noise, low power consumption, wide operating temperature range, and high random read performance. The capacity of the disk is relatively low in price, and it has the disadvantages of low random lowercase performance, must...

AI Technical Summary

Problems solved by technology

However, after adopting the global garbage collection strategy, the SSD array stops responding to user read and write requests during the garbage collection process, and the entire SSD array storage system cannot provide external services, which is unacceptable for applications that require 7×24h st