First you need to configure RAID and load driver during OS installation. Since you'll install Linux, configure the SCUs in ESRT2 mode in BIOS, since RSTe is not yet supported under Red Hat Linux.
If you need help configuring RAID, see Demo: How to configure ESRT2 RAID using the BIOS console
Once RAID is configured, you can install OS. It's recommended to load the latest ESRT2 driver. Follow the steps in readme strictly for a successful installation.