Storage I/O Control is disabled on a datastore and cannot be enabled.

You cannot enable Storage I/O Control on a datastore.

The following reasons might prevent you from enabling Storage I/O Control on a datastore.

At least one host that is connected to the datastore is not running ESX/ESXi 4.1 or later.

You do not have the appropriate license to enable Storage I/O Control.

Verify that the hosts connected to the datastore are ESX/ESXi 4.1 or later.

Verify that you have the appropriate license to enable Storage I/O Control.