Patent ID: 7430572

Claim:
A disk array system comprising a plurality of disk drives, including: a plurality of first-type disk drives being used to form a first-type logical unit having a plurality of a first-type of chunks; a plurality of second-type disk drives being used to form a second-type logical unit having a plurality of a second-type of chunks; and a storage controller, if the storage controller copies data stored in a source chunk to a destination chunk, selecting the destination chunk from the first-type of chunks or the second-type of chunks; wherein the first-type disk drives are fibre-channel hard disk drives (FC-HDD); the second-type disk drives are serial-ATA hard disk drives (SATA-HDD); the first-type logical unit is a fibre-channel logical unit (FC-LU); the second-type logical unit is a serial-ATA logical unit (SATA-LU); the first-type of chunks are fibre-channel chunks (FC-chunks); and the second-type of chunks are serial-ATA chunks (SATA-chunks).