ONTAP 9.14

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Control and monitor I/O performance to FlexVol volumes by using Storage QoS

You can control input/output (I/O) performance to FlexVol volumes by assigning volumes to Storage QoS policy groups. You might control I/O performance to ensure that workloads achieve specific performance objectives or to throttle a workload that negatively impacts other workloads.

About this task

Policy groups enforce a maximum throughput limit (for example, 100 MB/s). You can create a policy group without specifying a maximum throughput, which enables you to monitor performance before you control the workload.

You can also assign SVMs, LUNs, and files to policy groups.

Note the following requirements about assigning a volume to a policy group:

  • The volume must be contained by the SVM to which the policy group belongs.

    You specify the SVM when you create the policy group.

  • If you assign a volume to a policy group, then you cannot assign the volume’s containing SVM or any child LUNs or files to a policy group.

For more information about how to use Storage QoS, see the ONTAP System Administration Reference.

  1. Use the qos policy-group create command to create a policy group.

  2. Use the volume create command or the volume modify command with the -qos-policy-group parameter to assign a volume to a policy group.

  3. Use the qos statistics commands to view performance data.

  4. If necessary, use the qos policy-group modify command to adjust the policy group’s maximum throughput limit.

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