Method and related apparatus for data migration of a disk array. While striping and migrating data of a source disk of the disk array, data stripes are grouped into different zones; after completely writing data stripes of a given zone to disks of the disk array, data stripes of next zone are written to disks of the disk array and the given zone. Because data stripes of the next zone will be distributed to various disks, only some of the data stripes will overwrite data stripes of the given zone. Therefore, the next zone can contain more data stripes than the given zone while keeping migration integration. In addition, by zones containing increasing number of data stripes, migration progress can be managed with ease and high efficiency achieving better data throughput.