Scalable data access system and methods of eliminating controller bottlenecks

A method of writing write data to at least one storage device comprising:

• generating a write request in a host process of a computer;
• passing the write request to a front-end storage controller (nFE_SAN);
• copying the write data to a cache memory of an FE_SAN driver in the computer;
• copying the write data to a cache memory of the nFE_SAN;
• generating a write lock request and transmitting the write lock request from the nFE_SAN over a network interconnect selected from a first and a second storage area interconnect to a selected back-end storage controller (nBE_SAN), the nBE_SAN selected from a first and a second nBE_SAN of a plurality of nBE_SANs according to logical block addresses (LBAs) identification associated with the write request, where a first of the nBE_SANs is assigned to write data associated with a first and second LBAs, and a second nBE_SAN is assigned to write data associated with third LBAs, the first, second, and third LBAs being different and the first nBE_SAN being different from the second nBE_SAN;
• returning a write lock grant from the selected nBE_SAN to the nFE_SAN;
• upon completing copying the write data to the cache memory of the FE_SAN driver and the cache memory of the nFE_SAN and receiving the write lock grant from the selected nBE_SAN, the nFE_SAN providing a write complete signal to the computer processor without waiting for copying the write data to the nBE_SAN to complete;
• copying the write data over a network interconnect selected from the first and second storage area interconnect to the selected nBE_SAN;
• and
• writing, by the selected BE_SAN, the write data to the at least one storage device.