I have an system running Windows Server 2012R2.
It has 2 drives on onboard SATA ports (the OS drive, and one more), and 8 drives connected to an LSI MegaRAID SAS 9240-8i. Four of the drives on the SAS controller are SATA drives used with DrivePool, and they all work perfectly and get smart data normally (after enabling unsafe IO).
The other 4 are 15k SAS drives used to make a mirrored windows storage space. These no longer show up as normal disks in windows. In Stablebit Scanner, it simply shows the name "Microsoft Storage Space Device" on the "Microsoft Storage Spaces Controler". This is expected.
What's not expected is the SMART data I see for the storage space device. Under disk details, it shows the serial number, firmware, rotation speed, port, capability and smart data of the OS drive. The Smart window for the storage space shows all the data for my OS drive as well.
I'm not sure if storage spaces emulate smart data, or provide some other useful mechanism to check their state - but showing the SMART data from another drive probably isn't a good thing. It would be better to show no smart data than incorrect data, in my opinion.
Of course, the BEST option would be for it to show the underlying drives...but that may not be possible with windows hiding them.