Multi-Function Quality of Service (QoS)

Why is Multi-Function Quality of Service Necessary?

By Gina Chen | Feb 28, 2022 | All, Enterprise

There is a lot of need for new requirements regarding data collection, analysis, and large data storage. This need has arisen from the development of various industries such as 5G applications, autonomous cars, big data, and Artificial Intelligence (AI). We can expect that the data volume requirement will raise at least 5 times from CY2018 to CY2025.

This rise in data volume requires storage devices to handle large amounts of data with the shortest latency possible. Providing high-quality service to support multiple functions with one drive has become a hot topic in recent years.

An important indicator to evaluate the performance of Enterprise SSD is Quality of Service (QoS). Single Root I/O Virtualization (SR-IOV) is a commonly used application by the good QoS of enterprise SSD. Generally, the host will implement a virtual switch mechanism to divide the data resource to each virtual machine, which will cause transition latency and impact the QoS. One way to combat this is to apply SR-IOV to physical devices. This will allow the dedication of bandwidth for each virtual machine without getting through the virtual switch, resulting in less latency with better QoS.

What is Single Root Input / Output Virtualization (SR-IOV)?

Concept

Assigns I/O hardware directly to virtual machines without getting through virtual machine manager
Allows the dedication of bandwidth (QoS) for virtual machines and associated applications

Benefit

Enable high I/O performance in virtualized environment
Conserves PCIe slots in server environment

Additional considerations for implementing SR-IOV

Alternative Routing ID Interpretation (ARI)

Increase the virtual function number from 8 to 256

Weighted Round Robin (WRR)

Classified SQ by workload
Resource allocation
Priority: Admin → Urgent → High → Medium → Low

How does Phison come into play?

Phison has embedded MF SR-IOV solution in ASICs which allows a single SSD to support various workloads and provides equal independent high-quality service for multiple users. This allows network service providers to service more users with the same amount of SSD to increase their competitiveness. Phison has cooperated with the first-tier companies and devoted time and effort for over 3 years and looks to continue to grow in the future.