Patent ID: 7620786
Filing Date: 2009-11-17
Classification: G06F

Abstract:
1. A method for recovering data in a redundant data storage system having a plurality of data storage units, said method comprising: storing said data on said plurality of data storage units according to a redundant data storage method; removing one of said plurality of data storage units for a period; starting a delta log separate from said plurality of data storage units concurrent with said step of removing one of said plurality of data storage units; changing a portion of said data on the remainder of said plurality of data storage units during the period when one of said plurality of data storage units is removed in accordance with the redundant data storage method; storing a record of said changes in said delta log during the period when one of said plurality of data storage units is removed; replacing said one of said plurality of data storage units; and updating said one of said plurality of data storage units by updating those portions of data recorded in said delta log.