SMI-S basically defines a method for the interoperable management of a heterogeneous Storage Area Network (SAN).
This is a bad news to to me, If I knew this is the case , I will not buy QNAP for our Hyper-V infrastructure.
so my advise is to look for another SAN that support SMI-S. Don't buy QNAP until they implement this feature and you can add your request/ vote for this feature :
http://forum.qnap.com/viewtopic.php?f=24&t=42395&p=238573#p238573