IO (input/output) scheduling method and apparatus based on array/LUN (Logical Unit Number)

Abstract

The invention is applicable to the technical field of computers, and provides an IO scheduling method based on an array / LUN, and the IO scheduling method based on the array / LUN is applied to a memory system. The method comprises the following steps: receiving a command for setting a priority for the array / LUN, and setting a plurality of priorities for the array / LUN; and carrying out IO scheduling processing to the array / LUN according to the priorities of the array / LUN. Preferably, the memory system is further used for receiving a processing command for defining an IO to the array / LUN. The invention further correspondingly provides an IO scheduling apparatus based on the array / LUN. According to the IO scheduling method based on the array / LUN and the IO scheduling apparatus based on the array / LUN, the priorities are set for the array / LUN in the memory system, the IO is subjected to fair scheduling, and the mutual influences among the arrays / LUNs can be effectively prevented.

Description

technical field [0001] The present invention relates to the field of computer technology, in particular to an array / LUN-based IO scheduling method and device. Background technique [0002] In the operating system, for multiple storage devices in the system, the operating system has mostly optimized the IO (input / output, input / output interface) scheduling strategy. The strategy is to ensure that each device does not affect each other and prevent a device from being busy. As a result, another device cannot continue to process IO. For example: in the linux operating system, the default IO scheduling algorithm is CFQ (Complete Fairness Queueing), and the optional scheduling algorithms include Noop, anticipatory and deadline. [0003] In addition, the following problems are encountered in the application: low-priority threads own resources and generate a large amount of IO, and IO requests are not considered in thread priority when constructing. That is to say, the IO has no co...

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Problems solved by technology

[0003] In addition, the following problems are encountered in the application: low-priority threads own resources and generate a large amount of IO, and IO requests are constructed without considering thread priority

However, in an independent storage system, host IO is sent to the storage system through the network, the context information of the host IO is lost, and there are multiple hosts, so the storage system needs to achieve fair scheduling, especially if there are multiple hosts in the system. When there are multiple LUNs (Logical Unit Numbers) in an array, or there are multiple LUNs (Logical Unit Numbers) in the same array, there is a problem that the arrays affect each other or the reading and writing of multiple LUNs in the same array affect each other.

[0005] In summary, the existing array / LUN IO height technology obviously has inconvenience and defects in actual use, so it is necessary to improve it

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