Conditional Journaling for Storage Class Memory Failure Recovery
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Solution Overview
Problem
Current computing devices face inefficiencies in accessing storage class memory due to high access latency and limited capacity, which can lead to increased processing load and data bandwidth usage, especially during failure recovery processes.
Innovation Solution
Implementing a storage class memory device with a journaling mechanism that creates entries only upon failure occurrence, allowing for efficient data recovery and remapping of logical addresses to physical addresses, thereby reducing processing load and data bandwidth usage while maintaining non-volatile storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If journaling mechanism is implemented for every access command, then data reliability is improved, but processing load and data bandwidth usage increase
Solution Approach 1:
The patent applies partial action by creating journal entries only for a subset of access commands - specifically those that fail or require recovery - rather than journaling every command. This selective approach maintains data reliability for critical operations while reducing the overall processing load and bandwidth consumption associated with comprehensive journaling.
Solution Approach 2:
The patent implements local quality by applying different journaling strategies to different types of access commands based on their failure characteristics. Successful commands may not require journaling, while failed commands or those involving recovery operations do require journal entries. This localized differentiation optimizes the balance between reliability and processing efficiency.
2Reliability
If journaling mechanism is implemented for every access command, then data recovery capability is improved, but data bandwidth usage increases
Solution Approach 1:
The patent reduces data bandwidth usage by applying partial journaling - only creating journal entries when necessary for recovery purposes rather than for every access command. This selective journaling maintains data recovery capability for failed operations while minimizing the bandwidth consumption associated with writing journal entries.
3Speed
If access latency is reduced, then system performance is improved, but storage capacity may be limited
Solution Approach 1:
The patent segments the storage class memory device into multiple planes, allowing parallel access operations that reduce access latency. By organizing memory into multiple independently accessible planes, the system can service multiple requests simultaneously, improving speed without requiring an increase in total storage capacity.
Data Source
AI summary
Systems and methods are disclosed for a journal for a storage class memory device. The storage class memory device may execute an access command for a first page in the storage class memory device. The storage class memory device may also determine whether a failure occurred while executing the access command. The storage class memory device may create an entry in a journal for the storage class memory device if a failure occurred while executing the access command. The storage class memory device may refrain from creating the entry if a failure does not occur while executing the access command.