Zoned Namespace Memory System Buffer Allocation
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Solution Overview
Problem
The number of open zones in a memory system is limited due to the size constraints of the write buffer, which restricts the number of application programs that can run simultaneously, leading to performance degradation and reduced efficiency in data processing.
Innovation Solution
The implementation of a memory system with a single-level cell (SLC) buffer that dynamically allocates regions of the write buffer across multiple zones, prioritizing zones based on usage and data size to increase the number of open zones, allowing for more concurrent application programs by temporarily storing data in an SLC buffer when the write buffer is full.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the write buffer size is increased to support more open zones, then the number of concurrent application programs increases, but the device complexity and manufacturing cost increase
Solution Approach 1:
The memory device is divided into multiple zones (first zone, second zone, third zone, etc.) with each zone having dedicated buffer regions. This segmentation allows independent management of buffer resources for different zones, enabling the system to support multiple concurrent applications without requiring a single large unified buffer, thus reducing overall device complexity while maintaining versatility.
Solution Approach 2:
The patent introduces a zoned namespace architecture that adds a dimensional layer of organization to the buffer management system. By organizing buffer regions in multiple dimensions (zone dimension, buffer region dimension), the system can accommodate more applications concurrently without linearly increasing the total buffer size, effectively resolving the contradiction between adaptability and device complexity.
2Productivity
If the write buffer is allocated to support more zones, then more application programs can run simultaneously, but the buffer size per zone decreases leading to performance degradation
Solution Approach 1:
The buffer allocation is made dynamic through the introduction of multiple buffer regions (first buffer region, second buffer region, third buffer region) within each zone. The controller can dynamically select which buffer region to use based on the current state and requirements, allowing the system to maintain performance stability while supporting multiple concurrent applications. This dynamic allocation prevents any single zone from being starved of buffer resources.
Solution Approach 2:
The system changes the parameter of buffer allocation from a static single-region-per-zone model to a dynamic multi-region-per-zone model. By introducing multiple buffer regions with different characteristics and enabling flexible selection among them, the system can adjust buffer parameters dynamically to maintain performance stability across multiple concurrent applications without requiring a proportional increase in total buffer size.
3Adaptability or versatility
If the number of open zones is limited by write buffer size, then device complexity remains low, but the number of concurrent application programs is restricted
Solution Approach 1:
The patent implements a nested structure where multiple buffer regions are nested within each zone, and multiple zones are nested within the overall memory device architecture. This nested organization allows the system to efficiently utilize buffer capacity across multiple concurrent applications by having hierarchical buffer management, thereby increasing adaptability without requiring a proportional increase in total buffer capacity.
Solution Approach 2:
The buffer regions are designed with multi-functionality, where each buffer region can serve multiple purposes and multiple zones can share the overall buffer resource pool. This universal design allows the same buffer infrastructure to support a larger number of concurrent applications through flexible allocation and sharing mechanisms, increasing adaptability without linearly increasing the total buffer capacity required.
Data Source
AI summary
A memory system with at least one namespace includes a memory device and a controller. The memory device includes a plurality of single-level cell (SLC) buffers and a plurality of memory blocks, wherein each memory block includes a plurality of memory cells, each memory cell storing multi-bit data, and is allocated for a respective one of a plurality of zones, wherein each of the at least one namespace is divided by at least some of the plurality of zones. The controller is configured to receive a program request related to at least one application program executed by a host, to determine at least one zone designated by the at least one application program as an open state, and to control the memory device to perform a program operation on at least one memory block allocated for an open state zone.