Hello diunida,   You can install your first hard drive, create it as a RAID0 install OS and do your testing.   When you get your second disk you can Reconfigure RAID0 to RAIA1 adding one hard drive   Starting And Target RAID Levels For Virtual Disk Reconfiguration And Capacity Expansion [URL]  
Hello, in h710p I would like to create a degraded raid matrix, eg mirror, with only one disk, the other would be degraded.Is it possible in h710p or 6/i (from R900 server)?
PowerEdge r720 PERC H710p created degraded raid