This application discloses a mirrored memory configuration method and apparatus, and a computer storage medium, and belongs to the field of information processing technologies. The method includes the following: After a computer apparatus is started, if the computer apparatus is currently in an OS state and obtains a mirrored memory establishment request, the computer apparatus may switch from the OS state to a BIOS state through system interruption. Then the computer apparatus configures a mirroring relationship in the BIOS state, and switches to the OS state again after configuring the mirroring relationship, to reconfigure a mirrored memory.