VIRTUAL DISK FILE FORMAT CONVERSION METHOD AND DEVICE

A virtual disk file format conversion method and an apparatus are disclosed, and relate to the field of virtualization technologies, so as to resolve a service interruption caused by offline conversion of a virtual machine disk image file format when a virtual machine is migrated between different types of VMMs. The method includes: establishing a mapping table between a virtual address of a virtual machine VM disk image file and a physical address of a disk image file that is compatible with a virtual machine monitor VMM; converting, according to the mapping table, the virtual address used when a user performs reading/writing on the VM disk image file, into the physical address mapped to the virtual address; and further performing data reading/writing on the VM disk image file based on the physical address.