Memory Snapshot Flushing During Power State Transitions
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Solution Overview
Problem
Existing memory systems experience unwanted latency and data loss during power down events due to the process of reading and copying data values, which reduces quality of service and hinders system operation upon power up.
Innovation Solution
Implementing techniques to write a snapshot of operational parameters to volatile memory and flush it to non-volatile memory with fewer operations, allowing data preservation in both partial and full power down scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is read and copied during power down events, then data can be preserved, but latency increases and quality of service deteriorates
Solution Approach 1:
The patent implements a changelog mechanism that continuously logs data modification information in real-time during normal operation. When a power down event is detected, the system only needs to flush this pre-prepared changelog to non-volatile memory instead of performing comprehensive data reads and copies, thereby preserving data while minimizing latency during the power transition.
2Reliability
If multiple read and copy operations are performed during power down, then data values are saved, but the number of operations increases and quality of service reduces
Solution Approach 1:
The patent extracts only the essential data modification information into a separate changelog structure, rather than copying entire data sets. This selective extraction approach allows the system to preserve critical data states with minimal operations, maintaining quality of service while ensuring data integrity during power down events.
Solution Approach 2:
Instead of copying actual data values multiple times during power down, the patent creates a single snapshot copy of the changelog containing modification metadata. This single copy operation replaces multiple traditional read-and-copy cycles, reducing operational overhead while preserving data recovery capability.
3Productivity
If traditional power down procedures are used, then system transitions occur, but data loss may occur and recovery is hindered
Solution Approach 1:
The system continuously maintains a changelog that records all data modification operations before power down occurs. This preliminary logging ensures that even if power is lost unexpectedly, the recorded changelog provides a recovery path to restore data consistency, preventing data loss while enabling rapid system recovery.
Data Source
AI summary
Methods, systems, and devices for data storage during power state transition of a memory system are described. A memory system may receive a command indicating a transition from a first power state to a second power state or a third power state. Upon receiving the command, the memory system may write a first set of data to a volatile memory of the memory system. For example, the first set of data may be a snapshot or a copy of one or more elements of a second set of data. The memory system may flush the first set of data from the volatile memory to a non-volatile memory of the memory system. The memory system may transition from the first power state to the second power state or the third power state and read the snapshot from the volatile memory or the non-volatile memory upon transitioning back to the first power state.