Reverse mirroring in raid level 1

摘要

Disclosed is a reverse mirroring RAID Level I system and method that decreases read access times. By recording mirrored data in a mirrored disk in a reverse order, spindle access time for data to be read from either the primary disk or the mirrored disk is reduced. As such, overall performance of the reverse mirroring technique is increased.

主权项

1. A method of storing data in a RAID Level I system comprising:
generating a write command to store said data; storing said data in a first order on a first disk in said system; storing data in a second order on a second disk in said system, said second order being a reverse order from said first order; generating a read command to read said data; determining a distance of a first spindle on said first disk from said data stored on said first disk to generate a first distance; determining a distance of a second spindle on said second disk from said data stored on said second disk to generate a second distance; and reading data from said first disk when said first distance is smaller than said second distance and reading data from said second disk when said second distance is smaller than said first distance, wherein said process of storing data in a first order comprises storing data in blocks on sequential sectors of said first disk and said second disk, and wherein said process of storing data in blocks on sequential sectors on said first disk comprises: storing data in blocks on sequential sectors on said first disk that are arranged from a first sector of said first disk to a last sector of said first disk; and, wherein said process of storing data in blocks on sequential sectors on said second disk comprises; and storing data in blocks on sequential sectors on said second disk that are arranged from a last sector of said second disk to a first sector of said second disk.