1. A method for accessing data in a storage system architecture, the storage system architecture comprising a host and a plurality of storage nodes, the method comprising: checking whether or not a data location information of a to-be-issued IO access command is in a cache memory of the host, wherein the data location information comprises a first validity check information; sending, by the host, the IO access command to a target storage node of the storage nodes according to the data location information when the data location information is in the cache memory, wherein the IO access command comprises the first validity check information; checking, by the target storage node, the validity of the IO access command according to the first validity check information; and executing, by the target storage node, the IO access command when the IO access command is valid.