Managing the Time Interval for the QoS option About this taskTo manage the time interval for the QoS option at the virtual disk level: Steps In the Quality Of Service (QoS) page, select Enable Quality of Service Settings. Set the Start Time. The start time can range from 1 to 24 hours. Click Apply Changes. NOTE: The Enable Quality of Service Settings option is enabled only if the Spin Down Configured Drives option is enabled.