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SmartQoS Feature Guide 11

OceanStor 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 V3 Storage System V300R003

This document describes the implementation principles and application scenarios of theSmartQoS feature. Also, it 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, snapshot or file system is determined by the importance of applications processed by the LUN, snapshot or file system. 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 or file system will be granted the low priority by default.
  • If a LUN, snapshot or file system 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, Snapshot or File System in Resource Type drop-down list box.
  5. Select the LUN , snapshot or file system 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, snapshot or file system 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 understood the consequences associated with performing this operation for confirmation and Click OK.

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

    3. Click Close.
Updated: 2018-09-03

Document ID: EDOC1000084215

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