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; 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 a first validity check information; checking, by the target storage node, the validity of the IO access command according to the first validity check information to determine the correctness of the address of the IO access command; and executing, by the target storage node, the IO access command when the IO access command is valid.