Patent ID: 8812902
Filing Date: 2014-08-19
Classification: G06F

Abstract:
1. A storage system comprising: a Redundant Array of Independent Disks (RAID) storage controller; and a plurality of storage devices coupled with the RAID storage controller on which the RAID controller stores one or more logical volumes, the plurality of storage devices comprising a spare storage device, wherein the RAID storage controller is adapted to configure a RAID level 5logical volume stored on the plurality of storage devices, wherein the RAID storage controller is further adapted to allocate the spare storage device to store additional redundancy information associated with the RAID level 5 volume, wherein the RAID level 5 volume in combination with the allocated spare storage device comprises an enhanced RAID level 5 volume, and whereby the RAID storage controller continues to operate the enhanced RAID level 5 volume to process I/O requests when two of the storage devices comprising the enhanced RAID level 5 volume fail.