When you enable Storage I/O Control, ESXi monitors datastore latency and adjusts the I/O load sent to it, if datastore average latency exceeds the threshold.


Launch the vSphere Client and log in to a vCenter Server system.


  1. In the vSphere Client inventory, select a datastore and click the Configuration tab.
  2. Click Properties.
  3. Under Storage I/O Control, select the Enabled check box.
  4. Click Close.


On the Datastores tab, the Storage I/O Control column shows that Storage I/O Control is enabled for the datastore.