Erasure Coded Storage Layout for Power Savings
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Solution Overview
Problem
Erasure coded storage systems face challenges in power savings due to the need to keep storage devices powered up to prevent latency associated with power-saving features, which increases the total cost of ownership (TCO).
Innovation Solution
Implementing a deterministic data layout that configures storage devices into active and inactive subsets within read/write sets, allowing some devices to operate in low power modes while maintaining minimal performance impact and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If storage devices are kept powered up to prevent latency, then data access speed is improved, but power consumption increases
Solution Approach 1:
The patent segments storage devices into multiple groups (first group, second group, third group) with different operational states. Some groups are kept powered up for immediate data access, while other groups can be powered down to save energy. This segmentation allows the system to balance between having devices ready for fast access and being able to power down devices to reduce power consumption.
Solution Approach 2:
The patent implements dynamic group management where the system can transition storage devices between different operational states (powered up, powered down, rebuilding) based on current system needs. Groups can be dynamically created, modified, and reassigned to balance performance and power savings requirements in real-time.
2Use of energy by moving object
If storage devices are powered down to save power, then power consumption decreases, but data access latency increases
Solution Approach 1:
The patent performs preliminary actions by pre-distributing data fragments across multiple storage device groups and maintaining rebuild capability. When a device needs to be powered down, the system has already replicated data across groups, allowing safe power-down without immediate performance impact. The rebuild capability is pre-established through erasure coding across groups.
Solution Approach 2:
The patent applies different operational qualities to different parts of the storage system. Different groups of storage devices have different operational states (some powered up, some powered down) based on local needs. This allows the system to optimize power savings in non-critical groups while maintaining performance in critical groups.
3Productivity
If data is randomly spread across storage devices, then write performance is improved, but power savings capability deteriorates
Solution Approach 1:
The patent segments the randomly distributed data fragments into groups associated with specific storage device groups. This allows the system to maintain the performance benefits of random distribution while organizing data into manageable segments that can be targeted for power management. Each group of storage devices can be independently managed for power savings.
Solution Approach 2:
The patent introduces group assignments as an intermediary layer between the random data distribution and the physical storage devices. Data fragments are randomly distributed but then assigned to specific groups, which are in turn mapped to storage devices. This intermediary grouping structure enables power management without disrupting the random distribution performance characteristics.
Data Source
AI summary
The present disclosure relates to systems and methods of an optimized data layout in an erasure coded storage system. The system may be realized as a deterministic layout of storage devices in an erasure coded storage system. The system implements a method for writing pieces of a data object across storage devices of a specified write set included an erasure coded storage subsystem. The system further implements a method for reading a subset of pieces of a data object from an active read subset of storage devices in a read set included in the erasure coded storage subsystem and restoring the data object from the subset of pieces. The system may further include operating an inactive read subset of storage devices in a read set in a low power mode.