Parity generation system for generating new parity using old data in temporary storage without accessing main disk storage of disk drive

摘要

PCT No. PCT/JP95/02518 Sec. 371 Date Jun. 5, 1997 Sec. 102(e) Date Jun. 5, 1997 PCT Filed Dec. 8, 1995 PCT Pub. No. WO96/18141 PCT Pub. Date Jun. 13, 1996In a computer system having a host system including a plurality of disk devices, a CPU, a main memory and a disk control circuit for controlling the disk devices, a host CPU executes a program unit to generate intermediate data for parity generation and holds it in a data holding unit to asynchronously conduct a data write process and a parity write process. A unit for generating parity and a unit for transferring data operate without the intervention of the CPU in accordance with a command issued by the program unit executed by the host CPU.