Storage Controller Write Segmentation for Power-Loss Data Retention
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Solution Overview
Problem
Existing storage systems face inefficiencies in write granularity, leading to compromised read performance and data loss during power outages due to the requirement for writes to be in multiples of logical pages, which cannot accommodate data sizes that do not evenly divide into these units.
Innovation Solution
The system reduces write granularity by caching remaining data in a buffer, such as DRAM, and upon detecting power loss, relocates this data to non-volatile memory for retention, ensuring data integrity and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If writes are performed in multiples of logical pages, then data integrity is maintained, but write granularity is compromised and data loss occurs during power outages
Solution Approach 1:
The patent segments data into multiple logical pages within a logical block, allowing individual pages to be written independently. This enables fine-grained write operations where data can be written in increments of logical pages rather than requiring entire logical blocks to be written, thus improving write granularity while maintaining data integrity through proper segmentation and tracking of written pages.
Solution Approach 2:
The patent performs preliminary actions by caching remaining data in a buffer before power loss occurs. The system proactively stores data that hasn't been written to non-volatile memory yet, and upon detecting power loss, it relocates this cached data to ensure data integrity. This preliminary caching action prevents data loss during power outages while allowing flexible write sizes.
2Adaptability or versatility
If data is cached in buffer to reduce write granularity, then write flexibility is improved, but data loss risk increases during power outages
Solution Approach 1:
The patent implements feedback mechanisms by monitoring power loss conditions and tracking the state of cached data in the buffer. When power loss is detected, the system receives feedback about the current state and automatically initiates data relocation from the buffer to non-volatile memory. This feedback-driven approach ensures that data flexibility is maintained during normal operation while reliability is restored when power loss occurs.
Solution Approach 2:
The patent applies preliminary anti-action by proactively relocating cached data to non-volatile memory upon detecting power loss conditions. This preemptive measure counteracts the potential harm of data loss before it can occur, allowing the system to maintain flexible write operations during normal operation while protecting against data loss when power failure is detected.
3Device complexity
If remaining data is discarded to simplify write operations, then device complexity is reduced, but productivity decreases due to performance loss
Solution Approach 1:
The patent introduces a buffer as an intermediary between the host system and the non-volatile memory. This buffer layer absorbs the complexity of managing partial writes and remaining data, allowing simple write operations from the host perspective while the buffer handles the complex task of tracking and managing unwritten data. The intermediary buffer maintains productivity by preserving remaining data for future writes rather than discarding it, thus improving storage performance without significantly increasing host-side complexity.
Data Source
AI summary
A storage array controller may receive a write request comprising data to be stored at one or more solid-state storage devices. A write granularity associated with the write request may be generated that is less than a logical block size associated with the storage array controller. The data associated with the write request may be segmented based on the generated write granularity. The write request may be executed to store the segmented data at the one or more solid-state storage devices.