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Modifying QoS Policies

Sara Levy
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Modifying QoS Policies from the VAST Web UI

  1. From the left navigation menu, select Element Store and then QoS Policies.

  2. Click ActionsButtonGUI2.png to open the Actions menu for the QoS policy you want to edit and select Edit.

  3. Change the settings as needed:

    Name

    A name for the QoS policy.

    Mode

    The QoS provisioning mode:

    • Static. Lets you set minimum and maximum static limits.

    • Used Capacity. Lets you set used capacity-based limits and maximum static limits.

    • Provisioned Capacity. Lets you set provisioned capacity-based limits and maximum static limits.

    For a detailed explanation of QoS limits and provisioning modes, see Quality of Service Overview.

    Limit By

    Performance characteristic(s) by which to limit service:

    • BW and IOPS. Lets you set limits on both bandwidth (BW) and I/O per second (IOPS).

    • BW. Lets you set limits on bandwidth only.

      Note

      When this option is selected, the fields for setting IOPS limits are inactive.

    • IOPS. Lets you set limits on IOPS only.

      Note

      When this option is selected, the fields for setting bandwidth limits are inactive.

    Static limits

    QoS limits per view.

    Note

    Minimum limits can only be set when the Mode is Static.

    • Min Read BW and Max Read BW. Minimum and maximum read bandwidth to provision. Enter a value and select the measurement unit from the Scale dropdown. '0' means no limit is set.

    • Min Read IOPS and Max Read IOPS. Minimum and maximum read IOPS to provision.

    • Min Write BW and Max Write BW. Minimum and maximum write bandwidth to provision. Enter a value and select the measurement unit from the Scale dropdown.

    • Min Write IOPS and Max Write IOPS. Minimum and maximum write IOPS to provision.

    Tip

    If Limit By is set to BW and IOPS, you must set Max Read IOPS to be equal to or greater than Max Read BW.

    Per Capacity limits

    QoS limits per unit of used or provisioned logical capacity, depending on the provisioning mode. Units are stated per limit.

    • Read BW per GB. Maximum read bandwidth (in MB/s) to provision per GB of used or provisioned logical capacity, depending on the provisioning mode.

    • Read IOPS per GB. Maximum read IOPS to provision per GB of used or provisioned logical capacity, depending on the provisioning mode.

    • Write BW per GB. Maximum write bandwidth (in MB/s) to provision per GB of used or provisioned logical logical capacity, depending on the provisioning mode.

    • Write IOPS per GB. Maximum write IOPS to provision per GB of used or provisioned logical capacity, depending on the provisioning mode.

  4. Click Update to save your changes.

Modifying QoS Policies from the VAST CLI

To modify a QoS policy from the VAST CLI, use the qospolicy modify command.

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