Configuring I/O Priorities

Prerequisites

At least one LUN, snapshot, or file system has been created.

Context

• 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.
• After a LUN, snapshot, or file system is created, its I/O priority can be manually changed.

Procedure

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 from the Resource Type drop-down list.
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.

   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 Warning dialog box is displayed.

   2. Confirm the information in the dialog box, select I have read and understand the consequences associated with performing this operation, and click OK.

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

   3. Click Close.