Multi-device mirror images and stripe function-providing disk cache method, device, and system

Abstract

The invention provides a method, a device, and a system for proceeding IO input and output operation on multiple cache devices. The method comprises the steps that a cache management module reads cache block information which comprises at least two addresses, wherein the at least two addresses point to least two different SSD cache devices; and the cache management module initiates data-reading operation on the at least two SSD cache devices according to the at least two addresses in the cache block information. The invention embodiments realize multiple-device parallel processing required by IO by configuring buffer block stripes in cache devices, and reading performance of cache blocks is improved; and data reliability is improved by adding mirror image copies to a dirty cache block.

Description

technical field

[0001] The present invention relates to data caching. Background technique

[0002] As we all know, the input-output (IO) speed between disk and memory has always been an important bottleneck of system performance. In IO-intensive application scenarios, the CPU often needs to wait for disk IO. At present, many systems use memory or similar volatile media as disk cache to improve IO speed. However, the price of the memory is relatively expensive, and the data will be lost after the power is turned off. According to the locality principle of the program, a high-speed memory with a capacity between the disk and the memory can be set between the main memory and the disk, and a part of instructions or data near the address of the instruction being executed can be transferred from the disk to this memory, which greatly improves the performance of the program. Shorten the time the CPU waits for data. This has a great effect on improving the running speed of the ...

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