Server system and data access method using the same

A data access method, adapted for a server system, wherein the server system comprises a first server and a second server, the first server comprises a first host, a first expander unit, and a first peripheral device, and the second host comprises a second host, a second expander unit, and a second peripheral device, wherein the first expander unit and the second expander unit are directly connected to each other through a serial attached small computer system interface or a peripheral component interconnect express bus, wherein when the first host and the second host function normally, the first host accesses the first peripheral device through the first expander unit and the second host accesses the second peripheral device through the second expander unit, the data access method comprising:

• determining whether the second host changes from normal function to malfunction;
• and
• accessing the second peripheral device through the first expander unit and the second expander unit by using the first host through the serial attached small computer system interface or the peripheral component interconnect express bus between the first expander unit and the second expander unit when the second host changes from normal function to malfunction,
• wherein the second expander unit is coupled to the second host through a data bus or a peripheral component interconnect express bus.