Product : NetApp, NetApp HCI [HCI]/1.8 P1, x86
Feature : QoS Type, Performance, Data Services
Content Owner:  Herman Rutten
IOPs Limits (maximums)
IOPs Guarantees (minimums)
QoS is a means to ensure specific performance levels for applications and workloads. There are two ways to accomplish this:
1. Ability to set limitations to avoid unwanted behavior from non-critical clients/hosts.
2. Ability to set guarantees to ensure service levels for mission-critical clients/hosts.

NetApp HCI supports both methods through pre-defined performance policies per volume. These policies can be changed at any point in time and on-the-fly.

NetApp HCI provides the following three-dimensional QoS settings for every individual volume/Vvol:
- Minimum IOPS: The minimum number of IOPS guaranteed for the volume.
- Maximum IOPS: The maximum number of IOPS allowed for the volume.
- Burst IOPS: The maximum number of IOPS allowed over a short period of time for the volume.

The IOPS values entered are normalized to a 4K IO size. The configuration screen shows the calculation for 8K, 16K and 256K IO sizes, as well as MBps for Maximum Bandwidth.