NCR Corp, which pioneered the Small Computer System Interface has three SCSI Redundant Array of Inexpensive Disks controllers for the OEM market. In September, it announced its 6298 disk array subsystem and integrated disk arrays on some System 3000 models and in November, signed with Seagate Technology Inc for the development of high-performance arrays. The low-end SCSI disk array chip set comprises two chips, NCR 53C916 fast and wide with 20Mbyte-per-second transfer rate 16-bit SCSI chip and NCR 53C920 SCSI data path chip. The high-performance set adds NCR 53C932 SCSI bus extender chip for 32-bit SCSI bus and four RAID chips designed for maximum array peformance. They are offered as the ADP-92-01 SCSI array controller board that can manage up to five disk drives in RAID 0, 1, 3 or 5 mode; RAID 0 is striping without parity; RAID 1 is mirrored disk array, 3 is a parallel array, 5 is an independent disk array with parity spread across all the drives.
