Abstract: A method of data storage based on a redundant array of independent disks (RAID), where the RAID includes a plurality of solid state drives (SSD), each SSD including a persistent memory region (PMR) and a NAND, includes writing first data into the NAND, and writing first check data into the PMR. The first check data is check data related to the first data.

Abstract: An access method of a storage device and a virtual device are provided. The storage device supports a single root input output virtualization (SR-IOV), the storage device is virtualized as at least two virtual functions (VFs), the access method comprises: in response to an input/output (I/O) request for the storage device by an application, transmitting the I/O request to a corresponding VF by a virtual machine, the VF writing a completion message of the I/O request to a completion queue (CQ); querying the CQ in a polling manner by a processor of the virtual machine; and if there is the completion message of the I/O request in the CQ, returning the completion message to the application by the virtual machine.