The embodiment of the invention provides a memory expansion
system and method, a switch and a
memory pool, the
system comprises a computing node supporting a computer high-speed
interconnection protocol, the switch and the
memory pool, the switch comprises a switch
chip and a controller used for managing the switch
chip, a processor in the computing node is connected with an uplink port of the switch
chip, and the processor is connected with the
memory pool. The memory
pool comprises a plurality of
extended memory media, and the plurality of
extended memory media are respectively connected with different downlink ports of the switch chip. And the controller is used for configuring a corresponding relation between an uplink port and a downlink port of the switching chip so as to reflect the memory which can be expanded and used by the processor in the computing node. In the scheme, a memory
pool which is shared by a plurality of computing nodes and supports the CXL protocol is arranged, and an independent switch which supports the CXL protocol is arranged, so that the aim of flexibly expanding memories used by processors in the computing nodes is fulfilled through the switch.