Short answer - no.  The FLARE OS code resides on a Private area reserved on the Vault drives.  You can provision space from the Vault drives, but not the OS area.  You can remove LUNs provisioned from the User area on the Vault drives without destroying the FLARE OS region. Let us know if that helps!  Karl
I have a raid group that includes every disk my DPE2.  I want to remove the system disks (0-4) from this RAID group.   From what I read I should i put them in their own RAID group and avoid storage user data on them if possible.  Will destroying this RAID group blow out the data on these disc? Would that mean I'd have to re-install FLARE? 
Removing system disks from a RAID group (cx300)?