A:The number of disks RAID (Intel RST) supports varies depending on the RAID type, what is the maximum and minimum number of disks supported

RAID 0: 2 disks minimum (6 Max)
RAID 1: 2 disks only
RAID 5: 3 disks minimum (6 Max)
RAID 10: 4 disks only

For further information, please refer to the Intel® RST Support Knowledge Base.
https://www.intel.com/content/www/us/en/support/articles/000035308/technologies/intel-rapid-storage-technology-intel-rst.html