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SmartQoS Feature Guide
OceanStor Dorado V3 Series V300R001

This document is applicable to OceanStor Dorado5000 V3, Dorado6000 V3, and Dorado18000 V3. It describes the implementation principles and application scenarios of the SmartQoS feature, and explains how to configure and manage SmartQoS.

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Configuring I/O Priorities

Configuring I/O Priorities

The I/O priority of a LUN or snapshot is determined by the importance of applications processed by the LUN or snapshot. There are three I/O priorities available: high, medium, and low.


At least one LUN or snapshot has been created.


  • When you create a LUN, specify an I/O priority for the LUN. If the I/O priority is not specified, the LUN will be granted the low priority by default.
  • The created snapshot will be granted the low priority by default.
  • If a LUN or snapshot is created, its I/O priority can be manually changed.


  1. Log in to DeviceManager.
  2. Choose Provisioning > Resource Performance Tuning > SmartQoS.
  3. Click the Priority Control tab.
  4. Select LUN or Snapshot in Resource Type drop-down list box.
  5. Select the LUN or snapshot you want to modify.
  6. Click Modify I/O priority.

    The Modify I/O priority dialog box is displayed.

  7. Select a proper I/O priority to suit your service need.

    The system supports three I/O priorities: low, medium, and high. A LUN or snapshot with a high priority can obtain system resources preferentially. You can set different values for specific LUNs or snapshots based on service priorities, ensuring critical service performance.

  8. Confirm the I/O priority setting.

    1. Click OK.

      The Execution Result message box is displayed, indicating that the operation succeeded.

    2. Carefully read the content in the dialog box. Then select I have read and understand the consequences associated with performing this operation for confirmation and click OK.

      The Execution Result dialog box is displayed, indicating that the operation succeeded.

    3. Click Close.

Updated: 2018-10-19

Document ID: EDOC1000178797

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