Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

After you configure a unicast queue as strict-priority, that particular queue, on the entire chassis, is treated as a strict-priority queue. Traffic for a strict priority is scheduled before any other queues are serviced. For example, if you send 100% line rate traffic over the SP queue, it starves all other queues on the ports on which this traffic is flowing. To assign the strict priority schedule type to egress queues, use the scheduler strict command in QOS-POLICY-OUT mode. The system OS does not support bandwidth configuration on strict priority scheduler queues.

When you enable ETS, the egress QoS features in the output QoS policy-map (such as strict priority unicast <0-3> and scheduler strict), default scheduler for egress queues are superseded by ETS configurations. This is to provide compatibility with DCBX. Therefore, Dell Networking OS recommends disabling ETS when you wish to apply these features exclusively. After you disable ETS on an interface, the configured parameters are applied.