Zone-Based Memory Allocation for Write Error Management
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Solution Overview
Problem
Nonvolatile memory systems face reduced operational lifetime due to internal management operations like garbage collection and wear leveling, which require additional access and result in over-provisioning, reducing available storage capacity.
Innovation Solution
A memory system with a memory controller that allocates memory regions based on write requests, monitors data size, and determines whether to maintain or reallocate zones based on error detection, using threshold values for available capacity and write amplification factors to manage errors efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If internal management operations (garbage collection, wear leveling) are performed to prevent storage space waste, then storage space utilization is improved, but operational lifetime is reduced due to additional access requirements
Solution Approach 1:
The memory device is divided into multiple memory regions, allowing the controller to allocate specific regions for different purposes and manage them independently, reducing the impact of management operations on overall system lifetime
Solution Approach 2:
The controller allocates memory regions in advance based on allocation requests before actual data storage is needed, enabling proactive management of storage space and reducing the frequency and impact of subsequent management operations
2Reliability
If over-provisioning regions are allocated for internal management operations, then storage space waste is prevented, but available storage capacity is reduced
Solution Approach 1:
The memory region allocation is dynamic rather than static. The controller can allocate and reallocate memory regions based on actual usage patterns, error conditions, and system needs, allowing the same physical memory to serve both user data and management operations at different times
Solution Approach 2:
The system changes the operational parameters of memory regions based on detected errors and usage conditions. When errors are detected, the controller modifies allocation parameters, monitors data size, and adjusts region usage to maintain reliability without permanently sacrificing capacity
3Quantity of substance
If zone-based data storage is used in nonvolatile memory devices, then available capacity is improved, but error management complexity increases
Solution Approach 1:
The controller implements continuous monitoring of written data size in allocated memory regions. This feedback mechanism allows the system to detect errors, assess the extent of data affected, and make informed decisions about region reallocation without complex manual intervention
Solution Approach 2:
The memory management system performs self-diagnosis and self-correction by automatically detecting errors in allocated regions, monitoring data sizes, and reallocating regions as needed without requiring external intervention, simplifying error management despite the zone-based structure
Data Source
AI summary
A memory system may include a memory device including a plurality of memory regions and a memory controller configured to control the memory device and allocate some of the plurality of memory regions based on an allocation request of the memory device, the allocation request being provided from an external device. The memory controller is configured to perform a write request provided from the external device to at least one of the allocated memory regions, and monitor a size of written data in the at least one of the allocated memory regions based on the write request. When an error is detected in a first memory region among the allocated memory regions while performing of the write request of the external device, the memory controller is configured to determine whether to maintain the allocation of the first memory region.