PERC H730 controller in Raid but presenting storage disks to OS via Passthrough

HI, Forgive what may be a daft question. We have a Dell R730DX server with a PERC H730 controller, this supports HBA and Raid. However, we have a scenario where we have a need to run two disks for an OS in Raid 1 and present the balance of our disks to the OS directly/passthrough. Use case is for Virtuozzo Hybrid Server which recommend OS is redundant however storage disks should be presented directly to OS. Does anyone know is there any way to achieve this? Thanks, in advice.