QoS latency is observed for workloads utilizing QoS floors or adaptive QoS and the nodes hosting the workloads are experiencing a CPU bottleneck. To check if a node is experiencing a CPU bottleneck, t...QoS latency is observed for workloads utilizing QoS floors or adaptive QoS and the nodes hosting the workloads are experiencing a CPU bottleneck. To check if a node is experiencing a CPU bottleneck, the following command can be used: To check if the latency is due to QoS minimums, the following command can be used: cluster::> qos statistics volume latency show -volume VOLUME_NAME -vserver VSERVER_NAME The majority of latency will be observed under the column labeled Qos Min
This means the Ceiling is the greater of 1) Expected IOPS, 2) Peak IOPS, or 3) Absolute Minimum IOPS Example: A 10 GB Volume with a default Adaptive QoS "value" policy group will have a Floor of 75 IO...This means the Ceiling is the greater of 1) Expected IOPS, 2) Peak IOPS, or 3) Absolute Minimum IOPS Example: A 10 GB Volume with a default Adaptive QoS "value" policy group will have a Floor of 75 IOPs, not 1.28 IOPs Expected. Above the CPU headroom optimal point on ONTAP 9.7 and above, deadline IOPS will get the same values as below the optimal point and Best Effort IOPS are throttled heavier
