RAID Array Power Management via Data Concentration
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Solution Overview
Problem
Conventional power management protocols for RAID arrays are inefficient, as they often require all drives to remain powered up unless there is complete inactivity, leading to minimal power savings in modern storage systems that operate continuously.
Innovation Solution
A method and apparatus that concentrate data on a reduced number of physical drives within a RAID array, allowing for selective power management based on access frequency, where frequently accessed data is moved to a limited set of drives and less frequently accessed data is retained on other drives, enabling drives to be powered down or reduced in power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional power management logic is applied to RAID arrays, then drives can be spun down during inactivity, but all drives must remain powered up unless there is complete inactivity, resulting in minimal power savings
Solution Approach 1:
The patent segments the RAID array into active drives and inactive drives by concentrating data onto a subset of drives. This allows the system to power down only the inactive drives while maintaining data accessibility through the active drives, resolving the contradiction between power savings and data accessibility.
Solution Approach 2:
The patent performs preliminary data concentration onto a selected subset of drives before applying power management. By pre-moving data to the active drives, the system ensures that when power management is applied, data remains accessible without requiring all drives to be powered up, thus achieving both power savings and maintained productivity.
2Loss of energy
If data is striped across all drives in a RAID array, then data accessibility is maintained, but all drives must spin up when any data access occurs, preventing power savings
Solution Approach 1:
The patent segments the data storage across a subset of drives rather than all drives. By concentrating data onto a selected subset, the system allows those specific drives to remain powered up while others can be powered down, even though data access operations still occur. This resolves the contradiction by making power consumption dependent on the subset size rather than the total drive count.
Solution Approach 2:
The patent applies different power states to different drives based on their role in data storage. The selected subset of drives maintains a powered-up state for data accessibility, while other drives enter a powered-down state. This local differentiation of operational states allows the system to maintain ease of operation for data access while achieving overall power savings.
3Productivity
If all drives in a RAID array remain powered up, then data accessibility is ensured, but power consumption increases significantly
Solution Approach 1:
The patent segments the drive population into two groups: a selected subset that remains powered up for data accessibility and the remainder that can be powered down. This segmentation allows the system to maintain data accessibility through the active subset while significantly reducing overall power consumption by deactivating the inactive subset, directly resolving the contradiction between productivity and energy usage.
Solution Approach 2:
The patent applies partial power management by keeping only the necessary subset of drives powered up rather than all drives. This partial action approach ensures data accessibility is maintained through the active drives while avoiding the excessive power consumption that would result from keeping all drives powered up, thus resolving the contradiction between productivity and energy consumption.
Data Source
AI summary
There is provided a method and apparatus for power management in a storage resource. The storage resource comprises at least one RAID array including a plurality of physical drives. The method comprises: determining a reduced number of physical drives within a RAID array upon which data is to be concentrated; moving data stored on said RAID array and/or targeting data written to said RAID array to one or more of said reduced number of physical drives such that said data is concentrated on said reduced number of physical drives in said RAID array; and selectively applying power management logic to enable, based on at least one power management criterion, one or more physical drives in said RAID array to be powered down or to be supplied with reduced power.