Storage Controller Namespace Mapping Table Optimization
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Solution Overview
Problem
Current storage devices face inefficiencies in managing multiple namespaces, leading to increased storage space requirements for mapping tables and potential fragmentation due to the need for separate mapping tables for each namespace, which affects performance and resource utilization.
Innovation Solution
A storage device with a controller that dynamically allocates contiguous logical address spaces to namespaces and updates the mapping table accordingly, allowing for efficient creation and deletion of namespaces while maintaining contiguous logical address spaces, thereby optimizing storage and reducing fragmentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate mapping tables are used for each namespace, then namespace management is simplified, but storage space requirements and mapping table size increase
Solution Approach 1:
The patent merges multiple namespace mapping tables into a single unified mapping table. The controller manages multiple namespaces by allocating contiguous logical address spaces to each namespace and maintaining all mappings in one table, thereby reducing the total storage space required while preserving the ability to independently manage each namespace through logical address ranges.
2Adaptability or versatility
If separate mapping tables are used for each namespace, then namespace independence is maintained, but mapping table fragmentation occurs
Solution Approach 1:
The patent combines multiple namespace mappings into a single unified mapping table, eliminating fragmentation issues associated with multiple separate tables. Namespace independence is preserved through contiguous logical address space allocation, where each namespace occupies a specific range that can be independently managed while maintaining a consolidated table structure.
Solution Approach 2:
The patent implements dynamic namespace management where the controller can allocate, deallocate, and reorganize logical address spaces for namespaces as needed. This dynamic approach allows namespaces to be created and deleted without fixed structural constraints, preventing rigid fragmentation while maintaining independence through flexible address space management.
3Productivity
If contiguous logical address spaces are allocated to namespaces, then storage efficiency is improved, but mapping table updates become complex during namespace deletion
Solution Approach 1:
The patent employs dynamic logical address space allocation where the controller can reallocate address ranges when namespaces are created or deleted. When a namespace is deleted, the controller updates the mapping table to reassign its logical address space to adjacent namespaces, maintaining contiguity. This dynamic reallocation mechanism manages the complexity of updates while preserving storage efficiency through contiguous addressing.
Data Source
AI summary
A method of operating a storage device managing a multi-namespace includes storing first mapping information including a mapping between a first logical address space and a first physical address space to a mapping table, in response to a request to create a first namespace, the first logical address space being allocated to the first namespace, and storing second mapping information including a mapping between a second logical address space and a second physical address space to the mapping table, in response to a request to create a second namespace, the second logical address space being allocated to the second namespace and being contiguous to the first logical address space.