RAID Disk Power Cycling for Lower Energy and Drive Wear
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Solution Overview
Problem
RAID storage systems consume excessive power and reduce the lifespan of disk drives due to continuous operation, despite providing data protection against failures.
Innovation Solution
Implementing a method to power cycle disk drives selectively in RAID arrays, combining parity protection (RAID-5 or RAID-6) and mirroring (RAID-1), allowing some drives to be powered off while maintaining data integrity, and synchronizing data during recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RAID storage systems operate continuously to maintain data protection, then data reliability is improved, but power consumption increases and disk drive lifespan is reduced
Solution Approach 1:
The patent implements periodic power cycling of disk drives in RAID arrays, where drives are selectively powered off and on in a scheduled sequence. This allows the system to maintain data protection through RAID redundancy while reducing power consumption by keeping only necessary drives operational at any given time, directly resolving the contradiction between continuous operation reliability and energy efficiency
2Reliability
If RAID storage systems operate continuously to maintain data protection, then data reliability is improved, but disk drive lifespan is reduced
Solution Approach 1:
By implementing periodic power cycling schedules, the patent reduces the cumulative operating hours of individual disk drives while maintaining data protection through RAID redundancy. Drives are cycled through operational and powered-off states, extending their operational lifespan while the RAID array maintains data protection capabilities through distributed redundancy across multiple drives
3Use of energy by moving object
If disk drives are selectively powered off to reduce power consumption, then power efficiency is improved, but data availability may be compromised
Solution Approach 1:
The patent employs preliminary actions by maintaining RAID redundancy configurations and having recovery procedures pre-configured. Before powering off drives, the system ensures data is distributed across redundant drives. Upon drive failure, the system can rapidly recover by powering on standby drives and reconstructing data using RAID algorithms, thus maintaining data availability while achieving power efficiency
Data Source
AI summary
A method, computer system, and a computer program product are provided for operating a primary and a backup RAID storage array. A disk drive configuration is loaded into a disk controller in a primary RAID array and a disk controller in a backup RAID array. The disk drive configuration includes a schedule for a sequence of selectively power cycling the disk drives, which is executed by the disk controller in the primary and in the backup RAID arrays. Upon detecting a disk failure, each disk controller executes a recovery procedure according to instructions included in the disk drive configuration. Recovery procedure includes suspending power cycling all disk drives and powering on all intentionally powered off disk drives. Data is copied from the corresponding backup RAID array disk drive to primary RAID array to rebuild the failed drive. The RAID configuration remains in this state until failed disk drive is repaired.