Dynamic Namespace Capacity Allocation in NVMe Storage
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Solution Overview
Problem
Existing storage systems lack the ability to dynamically reallocate non-volatile memory capacity among namespaces within thinly provisioned data storage devices, leading to inefficiencies and capacity imbalances in RAID configurations.
Innovation Solution
Implementing a system that includes a controller capable of determining host connections to namespaces, allocating capacity from a floating namespace pool to target namespaces that need it, and managing RAID configurations to ensure efficient capacity utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If namespaces are allocated in fixed capacity blocks in thinly provisioned storage systems, then capacity can be added only as needed, but underutilized namespaces represent significant wasted capacity and cannot be dynamically reallocated
Solution Approach 1:
The patent implements dynamic capacity allocation by introducing a floating namespace pool that can be reallocated among namespaces based on current utilization needs. The controller continuously monitors namespace fill levels and automatically transfers capacity from underutilized namespaces to those that are filling faster, transforming the static fixed-block allocation into a dynamic system that adapts to changing storage demands.
Solution Approach 2:
The system changes the capacity parameter of namespaces dynamically by allowing the allocated capacity to vary over time. The controller modifies namespace capacity allocations based on monitored utilization patterns, enabling namespaces to expand or contract their capacity without requiring physical device changes or administrator intervention.
2Productivity
If capacity is allocated to specific namespaces in thin provisioned systems, then capacity can be managed per namespace, but capacity starvation occurs in fast-filling namespaces while other namespaces have unused capacity
Solution Approach 1:
The controller implements a feedback mechanism by continuously monitoring the fill levels of namespaces and using this information to make reallocation decisions. When a namespace approaches capacity limits, the controller detects this condition and automatically transfers capacity from the floating pool to prevent starvation, ensuring both high utilization and system reliability.
Solution Approach 2:
The floating namespace pool acts as an intermediary resource that mediates between namespaces with different utilization rates. Rather than directly allocating capacity from one namespace to another, the system uses the floating pool as a buffer and redistribution mechanism, allowing smooth capacity transitions while maintaining RAID configuration integrity.
3Adaptability or versatility
If disk drives have fixed capacity after deployment, then device simplicity is maintained, but it is not possible to add capacity to data storage devices after deployment
Solution Approach 1:
The floating namespace pool serves multiple functions: it acts as a capacity buffer, a redistribution mechanism, and a dynamic allocation source. This single universal structure enables the system to achieve post-deployment capacity expansion without requiring complex separate mechanisms for each function.
Data Source
AI summary
Systems, methods, and data storage devices for redundant storage of data across namespaces with dynamic capacity allocation are described. Data storage devices may support multiple host connections to multiple namespaces allocated in their non-volatile storage medium according to a storage protocol, such as non-volatile memory express (NVMe). Each namespace may initially be allocated with an allocated capacity. For at least some of the namespaces, a portion of the allocated capacity may be allocated to a floating namespace pool. A redundant array of independent disks (RAID) configuration may be established across the namespaces for redundant storage of host data. When the fill mark for one of the namespaces reaches a flexible capacity threshold, capacity from the floating namespace pool may be dynamically allocated to that namespace and removed from the floating namespace pool.