HP SureStore E SAN Manager LUN Management Administrator's Guide

156 Microsoft Cluster Server (MSCS)
Note SAN Manager LM devices cannot be unassigned while Cluster Server is running
because Cluster Server’s drivers have claimed the devices. To unassign devices,
shut down the cluster hosts or uninstall MSCS on the hosts, then unassign the
devices in the SAN Manager LM administration application.
You may need to re-apply current service packs after installing MSCS for the
first time. See your Microsoft documentation for more information.