How different types of QoS policies are displayed in Unified Manager

You can view the ONTAP-defined quality of service (QoS) policy settings that have been applied to a volume or LUN in the Performance Explorer IOPS, IOPS/TB, and MBps charts. The information displayed in the charts is different depending on the type of QoS policy that has been applied to the workload.

A throughput "ceiling" setting defines the maximum throughput that the workload can consume, and thereby limits the impact on competing workloads for system resources. A throughput "floor" setting defines the minimum throughput that must be available to the workload so that a critical workload meets minimum throughput targets regardless of demand by competing workloads.

Normal QoS policies for IOPS and MBps use the terms "minimum" and "maximum" to define the floor and ceiling. Adaptive QoS policies for IOPS/TB, which were introduced in ONTAP 9.3, use the terms "expected" and "peak" to define the floor and ceiling.

While ONTAP enables you to create these two types of QoS policies, depending on how they are applied to workloads there are three ways that the QoS policy will be displayed in the performance charts.

Type of policy Functionality Indicator in Unified Manager interface
QoS policy assigned to a single workload Workload can consume the entire throughput setting Displays "(QoS)"
QoS policy assigned to multiple workloads Workloads share the throughput setting Displays "(QoS Shared)"
Adaptive QoS policy assigned to a single workload or multiple workloads Workloads can consume the entire throughput setting Displays "(QoS Adaptive)"

The following figure shows an example of how the three options are shown in the counter charts.

When a normal QoS policy that has been defined in IOPS appears in the IOPS/TB chart for a workload, Unified Manager converts the IOPS value to an IOPS/TB value and displays that policy in the IOPS/TB chart along with the text "QoS, defined in IOPS".

When an adaptive QoS policy that has been defined in IOPS/TB appears in the IOPS chart for a workload, Unified Manager converts the IOPS/TB value to an IOPS value and displays that policy in the IOPS chart along with the text "QoS Adaptive, defined in IOPS/TB".

Note: The IOPS/TB chart displays performance data only when the logical capacity used by the volume is greater than or equal to 1 TB. Gaps are displayed in the chart when the used capacity falls below 1 TB during the selected timeframe.