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PowerScale: Network Design Considerations
Executive summary Network architecture design Latency, bandwidth, and throughput Ethernet flow control SyncIQ considerations Quality of Service (QoS)
Quality of Service (QoS)
Software-Defined Networking PowerScale OneFS ports SmartConnect considerations Ethernet, MTU, and IP overhead Access Zones best practices Source-Based Routing considerations Isilon 6th generation 1 GbE interfaces Intelligent Platform Management Interface IPv6 OneFS host-based firewall Network troubleshooting Appendix A: Supported network optics and transceivers Appendix B: Technical support and resources

Quality of Service (QoS)

Quality of Service (QoS)

  • 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 through different methods. However, the most common is through a Differentiated Services Code Point (DSCP), specifying a value in the packet header that maps to an effort level for traffic.

    PowerScale OneFS does not provide an option for tagging packets with a specified DSCP marking. As a best practice, configure the first hop ports on switches connected to PowerScale nodes to insert DSCP values. Note that OneFS does retain headers for packets that already have a specified DSCP value.

    Figure 6.   QoS and OneFS – Inserting DSCP values