IBM Midrange System DS4000 Series Hardware Manual page 470

Determining the driver and version in use
You can use the Windows Device Manager to check the driver and version being used:
If you are running MPIO, as shown in Figure 7-87, there is a module under the Storage
controllers tree that identifies the driver. Right-click it and select Properties to see the
version of the driver installed under the Driver tab.
If running the Storage Manager 10 Failover driver, you will find, under System devices, an
entry named IBM DS3000/DS4000 series Device Specific Module, as shown in
Figure 7-88 on page 453. This entry is used to set the failover policies.
If RDAC is installed, the devices are presented differently, and there is an RDAC Multipath
Pseudo-Bus entry under the Storage controllers folder of the Device Manager.
Figure 7-87 Determining the device driver in use
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IBM Midrange System Storage Hardware Guide