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SSD/ENT: Read-Optimized Mirrored RAID Using Mixed Drive Classes

IP.com Disclosure Number: IPCOM000192666D
Original Publication Date: 2010-Jan-28
Included in the Prior Art Database: 2010-Jan-28

Publishing Venue

IBM

Abstract

Solid state drives are much more expensive than enterprise hard disk drives. Today, users of enterprise storage systems must choose between high cost SSD drives capable of fast I/O, or slower I/O at significantly reduced cost. Customers also have to weigh having a more expensive RAID, such as RAID 10, which offers added data protection versus a cheaper RAID, such as RAID 5, with less data protection. Some applications have a high read-to-write ratio. It is desirable to have the same fast read access as SSD without having to pay the full price of SSD. It is also desirable to have the reliability benefits of a mirrored RAID such as RAID 10 at a reduced cost.