You must have the Storage Administrator (System Resource Management) role.
From the navigation tree, select Storage > Servers.
Click the server name to open the server details page.
From the inventory of volumes at the bottom of the details page, select the checkbox for the target volume, and then in the action bar, click Configure QoS Setting to edit settings.
Disable all QoS settings.
You can also perform this task by displaying the VOLUMES list page from the navigation tree.
When you Disable all QoS settings, and click Submit. The QoS settings for the applicable volume are cleared and any previously set values are deleted.