Massimo, we understand that once a RAID structure is created using the Intel(R) Rapid Storage Technology you cannot view the S.M.A.R.T. values of hard disk drive
S.M.A.R.T. means Self-Monitoring, Analysis, and Reporting Technology used to develop disk drives and software systems that automatically monitor and report disk drive health. Intel® Rapid Storage Technology (Intel® RST) — Unable to View S.M.A.R.T. Values After Setting Up a RAID Volume
I suggest you using RST version 12.9, since this is the more stable version so far.
If you want to check if the hard drives are OK after loading RST, what you need to so is run a diagnostic.
In order to run a diagnostic it will be necessary to take the disk out of the RAID. Once you finish the diagnostic you can rebuilt the RAID 1 again.