User-defined policy group - Enforces a maximum throughput limit on the storage objects that belong to the policy group by throttling input/output (I/O) requests See the article QoS Limits causing high...User-defined policy group - Enforces a maximum throughput limit on the storage objects that belong to the policy group by throttling input/output (I/O) requests See the article QoS Limits causing high volume latency and Can I increase IOPS on a QoS policy or will it cause performance problems? Again, see the article QoS Limits causing high volume latency and Can I increase IOPS on a QoS policy or will it cause performance problems?