The Intel® RAID Controller SRCS28X is not a "software" RAID controller. It is a hardware RAID controller based on the Intel® IOP331 I/O processor with support for RAID levels from 0, 1, 5, 10, and 50.
Does Arch Linix support and have a driver for the SRCS28X? Intel really only supports Redhat* and SUSE*. There are OpenServer* and Unixware 7.x* drivers available.
The SRCS28X has reached End of Interactive Support status with Intel.