Patent ID: 6021509
Filing Date: 2000-02-01
Classification: G06F

Abstract:
A method for rebuilding contents of a malfunctioned direct access storage device within a plurality of direct access storage devices forming a log-structured array, wherein each direct access storage device within said log-structured array is divided into a plurality of segment-columns and corresponding ones of said plurality of segment-columns from all direct access storage devices within said log-structured array constitutes a segment, said method comprising the steps of:locating an empty segment spanned across said malfunctioned direct access storage device;updating a pointer within a segment-column mapping table from pointing to a segment-column in said malfunctioned direct access storage device to point to a segment-column in a spare direct access storage device of said located empty segment;rebuilding contents of a non-empty segment in said malfunctioned direct access storage device within a segment-column in said spare direct access storage device; andmarking a segment as rebuilt in said segment-column mapping table after completion of said rebuilding of said non-empty segment.