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: receiving, by a master storage node of the storage nodes, a data location query command sent from the host; sending, by the master storage node, a data location information to the host in response to the data location query command, wherein the data location information comprises a first validity check information (VCI); receiving, by a target storage node of the storage nodes, an IO access command sent from the host, wherein the IO access command is sent according to the data location information and 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.