Method and device for controlling input and output flow of SSD cache

Abstract

The invention provides a method and device for controlling input and outlet flow of an SSD cache. The method comprises the steps that disk data of reading and writing processes or threads of a disk are intercepted, and the disk data are cached to the space of an SSD cache device to be used as cache data; whether the cache data are wiped to an external objective disk through a cache wiping thread is detected; cache wiping processing is judged and conducted; a scaling factor is generated through calculation, the cache data wiping speed of the SSD cache device is adjusted according to the scaling factor, and SSD cache flow is controlled until the cache utilization rate of the SSD cache device is lower than a preset second preset ratio. According to the method and device, IO flow entering in the SSD cache is dynamically controlled according to the IO flow of the external disk, and SSD space and performance are maximally used for meeting the demand of users.

Description

technical field [0001] The invention relates to the technical field of computer storage control, in particular to an input-output (IO) flow control method and an SSD cache device using SSD (Solid State Drive) as a cache for SSD cache. Background technique [0002] At present, the IO (Input / Output, input and output) speed of traditional storage (such as disk) has obviously become the storage performance bottleneck, and SSD (Solid State Disk, solid state drive) is used as the storage, so that the IO speed of the storage has been significantly improved, but due to The price of SSD is relatively high, and it cannot be installed and used in the entire storage, so it is used as a cache (Cache) in the prior art, that is, SSD is used as a layer of cache between the memory (memory) and the hard disk (external storage) (Cache) to buffer data to improve IO bandwidth and response speed, called SSD cache (SSD Cache). [0003] In the SSD cache method implemented in the prior art, a probl...

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Problems solved by technology

[0002] At present, the IO (Input / Output, input and output) speed of traditional storage (such as disk) has obviously become the storage performance bottleneck, and SSD (Solid State Disk, solid state drive) is used as the storage, so that the IO speed of the storage has been significantly improved, but due to The price of SSD is relatively high, and it cannot be installed and used in the entire storage, so it is used as a cache (Cache) in the prior art, that is, SSD is used as a layer of cache between the memory (memory) and the hard disk (external storage) (Cache) to buffer data to improve IO bandwidth and response speed, called SSD cache (SSD Cache)

[0003] In the SSD cache method implemented in the prior art, a problem needs to be solved, that is, in the case of heavy IO pressure, the space of the SSD cache will be consumed quickly. The data is written back to the destination disk. Since the IO speed of the disk is significantly slower than the IO speed of the SSD, compared with the cache (Cache), the inflow IO speed is much faster than the outflow IO speed, which will cause the cache (Cache) space to be exhausted. , resulting in bad situations such as denial of service

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