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

1

Browse to the datastore in the vSphere Web Client navigator.

2

Click the Manage tab.

3

Click Settings and click General.

4

Click Edit for Datastore Capabilities.

5

Select the Enable Storage I/O Control check box.

6

Click OK.

Under Datastore Capabilities, Storage I/O Control is enabled for the datastore.