IO cache operation method and system based on DM layer of Linux system

Abstract

The invention provides an input / output (IO) cache operation method and an IO cache operation system based on a device mapper (DM) layer of a Linux system. The method is implemented by a Linux kernel and comprises a reading process and a writing process. High-speed storage equipment is added as a cache of physical equipment, and the common data is put into the high-speed storage equipment, so that the performance of a disk accessed by a user is improved.

Description

technical field [0001] The invention relates to a reading and writing optimization technology for a slow disk device, in particular to an IO cache operation method and system based on a DM layer of a Linux system. Background technique [0002] The early computer systems only included very limited common storage devices, which can be accessed by mounting these storage devices to different places. The storage spaces of these different mount points cannot communicate with each other. Before using the limited storage devices, they must be A clear plan, otherwise unforeseen problems may occur during use, such as insufficient space. As more and more storage devices are added to the system, this one-to-one structure obviously cannot meet the needs of users, and even cannot create a partition that exceeds the size of the disk, even if the total amount of the disk is much larger than the size of the partition. The DM (Device Mapper) technology in the Linux system can solve such prob...

AI Technical Summary

Problems solved by technology

However, due to the use of mechanical devices on the disk, its speed improvement is far inferior to the speed of the processor and memory using integrated circuits, so some special mechanisms must be used to improve the IO performance of the system

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