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Applying QoS limit of 500 IOPS to a Volume consuming ~200 IOPS and latency goes crazy

Why when we apply a QoS Policy of 500 IOPS to a Volume consuming ~200 IOPS the latency goes up?

 

The QoS policy is not shared among other volumes, 1 QoS policy -> 1 volume. We are running ONTAP 8.3.1

 

 

qos_latency.png

 

Note: image from grafana & netapp harvest