Patent ID: 9189335
Filing Date: 2015-11-17
Classification: G06F

Abstract:
1. A storage system comprising: a plurality of drives configuring a first RAID group and a second RAID group; a controller being configured to: store first M data and first N parity data into first M+N parcels of first M+N drives included in the first RAID group, and second M data and second N parity data into second M+N parcels of second M+N drives included in the first RAID group, where the M and N are integers, wherein one of the drives in the first RAID group stores one of the first M+N parcels and one of the second M+N parcels, and another one of the drives in the first RAID group stores one of the first M+N parcels or one of the second M+N parcels; and for a failure that has occurred on one of the first M+N drives, recover one of the first M+N parcels which is stored in the failed one of the first M+N drives by utilizing other first M+N parcels, and copy the recovered one of the first M+N parcels and the other first M+N parcels to M+N parcels of M+N drives included in the second RAID group.