Cache replacement method for storage system software, storage device and storage medium

The invention discloses a cache replacement method for storage system software, which comprises the following steps: a storage device obtains an access request from a server; The storage device judgeswhether the access request is a large block of continuous read/write data. When the access request is a large block of continuous read/write data, the storage device allocates the access request to directly access the backend disk. When the access request is not a block of continuous read/write data, the storage device allocates the access request to access the front-end cache. The storage devicecomprises a front-end cache, a back-end disk and storage software for controlling the work of the front-end cache and the back-end disk. Embodiments of the present application also provide a storagedevice and a storage medium for executing the above method; At first, that application judge whether the access request is a large block of continuous read-write data, and if so, directly allocates the access back-end disk to p