Storage system, method and apparatus for processing data, non-transitory storage medium, and electronic device

A method for processing data, applied to a storage system, the storage system comprises:

• a first storage domain comprising a central processing unit, a first peripheral component interconnect express (PCIe) switch and a first port;
• and a second storage domain comprising a second PCIe switch, a second port and a plurality of first external storage devices, wherein the first port is a non-transparent bridge virtual port, the second port is a non-transparent bridge connection port, and the non-transparent bridge virtual port and the non-transparent bridge connection port are both arranged on the first PCIe switch, the method comprises:
• receiving a PCIe request transmitted by the central processing unit by the first PCIe switch;
• mapping the PCIe request from a first address space of the first port to a second address space of the second port by the first PCIe switch;
• and
• mapping the PCIe request from the second address space to a first target external storage device in the plurality of first external storage devices connected to a second PCIe switch by the second PCIe switch.