LarsB wrote:  Dynamox.  Actually the system is running with a combination of failover mode 1 and  failover mode 5 ( what is  failover mode 5?)  looks like a bug in Unisphere, see emc274475
All   After upgrading to vSphere 5, hardware acceleration status in vCenter displays unavailable for CX4 storage.  Is VAAI on vSphere 5 not supported for CX4, or is some kind of patch reqiored?  Rgds LarsB
Is VAAI and CX4 functional with vSphere 5 ?