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Using Hot Spare Disk Drives for Performance Enhancement in a RAID System

IP.com Disclosure Number: IPCOM000019208D
Publication Date: 2003-Sep-04
Document File: 2 page(s) / 35K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention is an apparatus for using hot spare disk drives for performance enhancement in a RAID system, including an active hot spare, a RAID controller, a plethora of hard disk drives, a data communications link, a primary volume, and a volume mirror. The method of the present invention includes the steps of assigning a hot spare as an active spare, building an active spare, detecting a hard disk drive failure, unassigning the active spare, and reassigning the hot spare to hard disk drive rebuild status.

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USING HOT SPARE DISK DRIVES FOR PERFORMANCE ENHANCEMENT IN A RAID SYSTEM

Robert Horn, Aristos Logic Corporation.

27051 Towne Centre Drive, Suite 290, Foothills Ranch, CA 92610

Abstract of the Invention

The present invention is an apparatus for using hot spare disk drives for performance enhancement in a RAID system, including an active hot spare, a RAID controller, a plethora of hard disk drives, a data communications link, a primary volume, and a volume mirror. The method of the present invention includes the steps of assigning a hot spare as an active spare, building an active spare, detecting a hard disk drive failure, unassigning the active spare, and reassigning the hot spare to hard disk drive rebuild status.

Description of the Invention

The present invention uses a RAID controller to identify volumes having high access levels and to mirror a copy of the volume data to hot spare disk drives to enhance volume performance. In the event of a disk drive failure, the hot spare is unassigned as an active spare and reassigned as a replacement in the RAID array.

Figure 1) RAID with active hot spare

Figure 1 illustrates a RAID system 100 in accordance with the present invention, including a RAID controller 110, a hard disk drive 1 120, a hard disk drive 2 130, a hard disk drive 3 140, an active hot spare 150,a data communication link 160, a volume 170, and a copied volume 180.

RAID controller 110 is a RAID controller that manages and maintains the functions and performance of all of the hard disk drives in RAID 100. RAID 100 can have as many hard disk drives as the specific hardware and underlying system parameters support, according to the choices of the organization and the system administrator. In this figure, hard disk drive 1 120, hard disk drive 2 130, and hard disk drive 3 140 represent all of the hard disk drives in the RAID array, and are electrically connected via data communication link 160. Data communication link 160 represents dual connections between each set of two serially arranged hard disk drives, and the hard disk drives are arranged in two parallel lines for the present invention, making for a total of four data communication links 160 in RAID 100. In the present invention, logically defined volumes organize the hard disk drive space. A single hard disk drive may contain several volumes, or...