Abstract:
A disk storage system that writes multiple copies of records directed to user-specified volumes. A plurality of spaced apart control units (112, 113) interconnected by direct data links (106) and a corresponding plurality of sets of recording means (109, 111) communicate over the direct data links (106) when a write request is received by one control unit (112, 113) to cause one volume in each set of recording means (109, 111) to write a copy of the received record.