Method for performing write operations in a parity fault tolerant disk array

摘要

A method for managing disk operations for a computer having a disk array utilizing parity fault tolerant and recovery techniques. A disk READ request results in a copy of the data and its associated parity information being stored in a reserved memory cache. Subsequent WRITE requests to the same disk sectors result in the computer system checking to see if a valid copy of the old parity and data are present in the reserved memory area for the purposes of generating new parity information without having to read the old data and parity information from the disk array.