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As more applications compete for a shared link with limited throughput, ensuring Quality of Service (QoS) for application success is critical. Each application has varying QoS requirements to deliver not only service availability, but also an optimal client experience. Associating each application to an appropriate QoS marking, provides traffic policing, allowing packets to be prioritized as required across a shared medium, all while delivering an ideal client experience.
QoS can be implemented using different methods. However, the most common is through a Differentiated Services Code Point (DSCP), which specifies a value in the packet header that maps to a traffic effort level.
The OneFS 9.9.0.0 release introduced an option for DSCP marking to provide QoS. The OneFS DSCP configuration is cluster-wide across all the nodes and is based on the class of network traffic. Once configured, OneFS inserts the DSCP marking in the Traffic Class or Type of Service fields of the header for IPv6 or IPv4 packets, respectively.