@ITstaff, welcome to the Rockstor community. While I am not the expert, if I remember correctly there are challenges with the SmartArray controllers, as they don’t really support a native RAID pass-through like JBOD.
While this post is based on the previous Linux CentOS distro, I think it might still hold true for the new OpenSUSE based version of Rockstor:
The only workaround I have found was to configure the SmartArray to essentially configure each drive to be its own RAID0 setup. Further, I did read that, unless a 256MB Battery Backed Write Cache BBWC memory module is installed you can only create two RAIDs using the controller.
Not sure that this is still the only way (as those posts were a few years old), but possibly @phillxnet can shed more light on this. With the nature of btrfs underlying Rockstor, the intent is to have it manage the disks and not the hardware RAID controller.