Dynamic MDTS Allocation for Multi-Tenant SSD QoS
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Solution Overview
Problem
Existing data storage devices, such as solid state drives (SSDs), face challenges in providing optimal quality of service (QoS) due to shared resources among multiple tenants, leading to suboptimal performance for both short and long commands, as they advertise a fixed maximum data transfer size (MDTS) that does not account for varying QoS requirements.
Innovation Solution
A data storage device with a controller that determines and allocates a maximum bandwidth to tenants, adjusting the MDTS and aggregated queue depth (QD) settings based on quality of service (QoS) requirements, allowing for differentiated MDTS per tenant and command type to optimize resource allocation and command processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed MDTS is advertised to all tenants, then device complexity is reduced and ease of operation is improved, but quality of service and resource allocation efficiency deteriorate
Solution Approach 1:
The patent implements dynamic MDTS adjustment where the controller modifies the maximum data transfer size parameter for each tenant based on real-time bandwidth allocation and QoS requirements. This allows the system to adapt resource allocation dynamically without requiring complex manual configuration, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The controller changes the MDTS parameter dynamically for different tenants based on their allocated bandwidth portions. By modifying this key parameter, the system achieves QoS differentiation and optimized resource allocation while maintaining a relatively simple controller architecture that only needs to adjust numerical values rather than restructure complex systems.
2Productivity
If bandwidth is allocated to multiple tenants, then resource utilization is improved, but command processing performance deteriorates due to shared resources
Solution Approach 1:
The patent segments the total interface bandwidth into distinct portions allocated to different tenants. The controller divides the maximum bandwidth by the number of tenants to determine individual bandwidth allocations, ensuring that each tenant receives a fair share while maintaining overall system productivity. This segmentation prevents any single tenant from monopolizing resources and degrading command processing performance.
Solution Approach 2:
The controller allocates bandwidth portions to tenants based on their specific needs and QoS requirements, providing partial bandwidth allocation rather than full allocation to each tenant. This approach allows multiple tenants to share resources effectively while ensuring that command processing performance is maintained through controlled resource distribution.
3Productivity
If MDTS is increased for long commands, then data transfer efficiency is improved, but short command performance deteriorates due to resource contention
Solution Approach 1:
The patent applies different MDTS values to different tenants based on their specific QoS requirements and workload characteristics. Tenants with long data transfer workloads receive higher MDTS allocations for improved efficiency, while tenants with short commands receive appropriate MDTS settings that optimize their execution. This localized quality adjustment resolves the contradiction by tailoring parameters to specific usage patterns.
Data Source
AI summary
A data storage device includes a memory device and a controller coupled to the memory device. The controller is configured to determine a maximum bandwidth of an interface, allocate a portion of the maximum bandwidth to one or more tenants, either: determine a maximum data transfer size (MDTS) setting based on quality of service (QoS) requirements, determine an aggregated queue depth (QD) setting based on QoS requirements, or determine a combined MDTS and aggregated QD setting based on QoS requirements, and provide the determined settings to the one or more tenants.