SSD Drive State Switching for Write-Balanced Power Saving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing storage apparatuses with SSDs face increased power consumption and drive failures due to data write, which are not adequately addressed by prior technologies like JP 2010-33261 A.
Innovation Solution
A storage apparatus that records statistical information on data write for each drive and switches between drives in a power saving and non-power saving state, moving data to minimize write frequency on high-write drives and set them to power saving mode, thereby reducing power consumption and preventing failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If data arrangement is biased to some drives to shift other drives to power saving state, then power consumption is reduced, but data write frequency increases on active drives causing drive failure
Solution Approach 1:
The patent implements dynamic drive state management by continuously monitoring data write statistics and automatically transitioning drives between active and power-saving states based on current workload conditions, making the system adaptive rather than static
Solution Approach 2:
The system changes the operational parameters of drives by adjusting their state (active vs. power-saving) based on monitored write frequency statistics, optimizing power consumption while maintaining reliability through parameter-based control
2Reliability
If drives are kept in non-power saving state to prevent data write failures, then drive reliability is maintained, but power consumption increases
Solution Approach 1:
The patent applies partial action by keeping only the necessary minimum number of drives in active state based on actual data write requirements, rather than keeping all drives continuously active, thus reducing power consumption while maintaining sufficient reliability
3Duration of action of stationary object
If data is moved frequently between drives to balance write frequency, then drive lifespan is extended, but system complexity and operation time increase
Solution Approach 1:
The system employs feedback control by monitoring data write statistics from each drive and using this information to make intelligent decisions about data migration, creating a closed-loop system that balances drive usage without excessive complexity
Solution Approach 2:
The system performs self-service by automatically monitoring its own drive statistics and executing data migration operations without external intervention, managing its own load balancing and lifespan optimization autonomously
Data Source
AI summary
A storage apparatus includes a plurality of physical drives and a storage controller configured to control access to the physical drives. The storage controller records statistical information related to data write of each of the plurality of physical drives, and executes a replacement process between one or more first physical drives in a non-power saving state and one or more second physical drives in a power saving state, the second physical drives being different from the first physical drives and the statistical information indicating fewer writes than the first physical drives. The replacement process includes setting the second physical drives to the non-power saving state, moving data from the first physical drives to the second physical drives set in the non-power saving state, and setting the first physical drives from which the data has been moved to the power saving state.