Split parity spare disk achieving method in raid subsystem
First Claim
1. A split parity spare disk achieving method for improving the defect endurance and performance of a RAID (Redundant Arrays of Inexpensive Disks) subsystem which distributively stores data in a disk array consisting of a plurality of disk drives and carries out an input/output operation in parallel, said method comprising the steps of:
- constructing said disk array with at least two data disk drives for storing data, a spare disk drive used when a disk drive fails and a parity disk drive for storing parity data; and
splitting said parity data of said parity disk drive, and storing the split data in said parity disk drive and said spare disk drive.
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Accused Products
Abstract
A split parity spare disk achieving method for improving the defect endurance and performance of a RAID subsystem which distributively stores data in a disk array consisting of a plurality of disk drives and carries out an input/output operation in parallel includes the steps of: constructing the disk array with at least two data disk drives for storing data, a spare disk drive used when a disk drive fails and a parity disk drive for storing parity data; and splitting the parity data of the parity disk drive and storing the split data in the parity disk drive and the spare disk drive.
120 Citations
10 Claims
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1. A split parity spare disk achieving method for improving the defect endurance and performance of a RAID (Redundant Arrays of Inexpensive Disks) subsystem which distributively stores data in a disk array consisting of a plurality of disk drives and carries out an input/output operation in parallel, said method comprising the steps of:
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constructing said disk array with at least two data disk drives for storing data, a spare disk drive used when a disk drive fails and a parity disk drive for storing parity data; and splitting said parity data of said parity disk drive, and storing the split data in said parity disk drive and said spare disk drive. - View Dependent Claims (2)
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3. A split parity spare disk achieving method for improving the defect endurance and performance of a RAID (Redundant Arrays of Inexpensive Disks) subsystem which distributively stores data in a disk array consisting of a parity disk drive, a spare disk drive and a plurality of data disk drives and carries out an input/output operation in parallel, said method comprising the steps of:
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splitting parity data stored in said parity disk drive into upper block parity data and lower block parity data, and storing said upper block parity data in a upper block storage region of said parity disk drive and storing said lower block parity data in a upper block storage region of said spare disk drive; defining the prescribed number of disk drives except said spare disk drive as small parity groups, and generating small group parity data by using disk drives of a small parity group which includes said parity disk drive; and splitting said small group parity data into small group upper block parity data and small group lower block parity data, and storing said small group upper block parity data in a lower block storage region of said spare disk drive and storing said small group lower block parity data in a lower block storage region of said parity disk drive. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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Specification