For SGX-SAS6-INT-Z – You can install an OS on a drive without creating a RAID volume. However, if you want to install the OS from an OS install disk, you will need to create the RAID volume before installing the OS.
For SGX-SAS6-R-INT-Z – You must create a RAID volume before installing an OS on a drive. You must also make the drive bootable.
For information on creating RAID volumes and making drives bootable, see the Installation, Configuring Server Drives for OS Installation.