Storage Write Buffer Switching to Complete Writes Before Power-Off
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Solution Overview
Problem
Storage devices face data loss during power off due to incomplete write operations when receiving a power off request.
Innovation Solution
The storage device includes a write buffer with first type memory blocks and selectively adds second type memory blocks to the buffer when a threshold condition is met, ensuring data is stored before power off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the storage device uses only first type memory blocks for the write buffer, then the buffer management is simple, but the write operation speed is insufficient to complete data storage before power off
Solution Approach 1:
The memory blocks are segmented into two types: first type memory blocks for normal write buffer operations and second type memory blocks for high-speed power-off protection operations. This segmentation allows the system to use different memory characteristics for different operational requirements, achieving fast write completion before power off while maintaining manageable buffer control through type-based classification.
Solution Approach 2:
The write buffer composition is made dynamic by selectively adding second type memory blocks when power off is detected. The buffer transitions from a static configuration (only first type blocks) to a dynamic configuration that includes both first and second type blocks during power-off events, enabling adaptive performance optimization based on operational conditions.
2Reliability
If the storage device completes all write operations before power off, then data integrity is maintained, but the time required may exceed the available power-off window
Solution Approach 1:
The storage device performs preliminary actions by pre-positioning data in the write buffer using fast second type memory blocks before the power-off request is fully processed. This preliminary high-speed storage ensures that critical data is secured in non-volatile or cached locations within the available time window, maintaining data integrity even when the complete write process cannot finish before power loss.
Solution Approach 2:
The system creates a protective cushion by using second type memory blocks to rapidly store write data in a safe state before power off occurs. This cushioning mechanism ensures that even if power is cut short, the buffered data is already protected in a stable state, preventing data loss and maintaining integrity without requiring the full write cycle to complete.
3Productivity
If the storage device adds second type memory blocks to the write buffer during power off request, then the write operation completes faster, but the memory resource allocation becomes more complex
Solution Approach 1:
Different quality characteristics are assigned to different memory blocks: first type blocks provide standard performance for normal operations, while second type blocks provide high-speed performance for power-off protection. This local quality differentiation allows the system to optimize write completion rate by deploying second type blocks specifically where needed during power-off events, without requiring all memory resources to be high-performance, thus managing complexity through targeted deployment.
Data Source
AI summary
A storage device may set a write buffer including one or more of a plurality of first type memory blocks. And the storage device may determine whether a threshold condition is satisfied when a power off request is received, and add one or more target memory blocks selected from among a plurality of second type memory blocks to the write buffer when it is determined that the threshold condition is satisfied.