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.

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.