The invention discloses a storage system architecture and a data access method thereof. The storage system architecture includes a plurality of data storage subsystems coupled to a host to receive I/Orequirements from the host. The plurality of data storage subsystems comprises a redundant disk array layer used for generating a plurality of media areas; a virtualization module which is used for forming one or more virtual volumes from the plurality of media regions and presenting the virtual volumes to the host; an airborne multi-platform compatible module which is used for providing a data access interface between the host and the storage system architecture and analyzing the I/O requirements from the host into at least one sub I/O requirement so as to forward the sub I/O requirements tothe plurality of data storage subsystems; and a media area server module which is used for verifying the validity of at least one sub I/O requirement. Accordingly, the host can send an I/O request toany data storage subsystem in the plurality of data storage subsystems.