A storage device operation method is applied to the physical server. A storage card is inserted into the physical server. When a virtual machine on the physical server receives a data read/write instruction, the virtual machine generates an I/O request for a physical storage device, and sends the I/O request to a client in the storage card; the client transmits the I/O request to a server, so that the server performs an I/O operation on the physical storage device based on the I/O request. Since the virtual machine directly sends the I/O request to the client in the storage card without using a hypervisor in the physical server, computing resources of the physical server are conserved.