Memory Rebuild Using Sequential Address Mapping Metadata
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Solution Overview
Problem
Memory systems face significant resource consumption during address mapping rebuild operations, particularly in sequential write modes, due to the need to periodically store checkpoints and access metadata for each physical address, leading to increased computation time and power usage.
Innovation Solution
The memory system stores metadata indicating sequential data patterns, allowing for algorithmic rebuilding of address mappings without accessing metadata for each physical address, thereby reducing resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory system periodically stores checkpoints and accesses metadata for each physical address during sequential write mode, then the address mapping rebuild reliability is improved, but the computation time and power usage increase significantly
Solution Approach 1:
The patent extracts only the essential information needed for rebuild (sequential write indicator and starting logical address) from the metadata, rather than accessing complete metadata for each physical address. This selective extraction maintains rebuild reliability while significantly reducing computation time and power consumption during rebuild operations.
Solution Approach 2:
The patent performs preliminary actions by storing the sequential write indicator and starting logical address in the data structure during the sequential write operation itself. This preliminary preparation eliminates the need for time-consuming metadata access during rebuild, as all necessary information is already prepared and stored in an optimized format.
2Reliability
If the memory system periodically stores checkpoints and accesses metadata for each physical address during sequential write mode, then the address mapping rebuild reliability is improved, but the power usage increases significantly
Solution Approach 1:
The patent extracts only the essential information needed for rebuild (sequential write indicator and starting logical address) from the metadata, rather than accessing complete metadata for each physical address. This selective extraction maintains rebuild reliability while significantly reducing computation time and power consumption during rebuild operations.
Solution Approach 2:
The patent applies partial action by storing only the critical subset of information (sequential indicator and starting address) rather than complete metadata. This partial storage approach provides sufficient information for reliable rebuild while avoiding the excessive power consumption associated with storing and accessing full metadata for every physical address.
3Manufacturing precision
If the memory system stores metadata for each physical address, then the address mapping accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent extracts only the essential information needed for rebuild (sequential write indicator and starting logical address) from the metadata, rather than accessing complete metadata for each physical address. This selective extraction maintains rebuild reliability while significantly reducing computation time and power consumption during rebuild operations.
Solution Approach 2:
The patent creates a universal data structure that serves multiple functions: it tracks sequential write operations, stores starting logical addresses, and enables efficient rebuild operations. This multi-functional approach maintains address mapping accuracy while reducing device complexity by eliminating the need for separate comprehensive metadata storage and access mechanisms.
Data Source
AI summary
Methods, systems, and devices for techniques for memory system rebuild are described. In some cases, a memory system may store an indication of whether data stored to one or more physical addresses is sequential using metadata associated with the one or more physical addresses. For metadata corresponding to a beginning physical address, the memory system may store an indication of a quantity of physical addresses subsequent to the beginning physical address with sequential corresponding logical addresses. Additionally or alternatively, the memory system may store an indication of a quantity of physical addresses preceding a last physical address with sequential corresponding logical addresses. During a rebuild operation, the memory system may read the stored indication and may rebuild an address mapping algorithmically using the stored indication.