I am preparing for upgrading CCM 3.3(4) to 4.3(1) and was thinking about one thing. I have MCS-7835H-2.4-EVV1 with two discs with mirroring RAID. I would like to remove one of those two discs and perform upgrade on remaining one. After new CCM is up and running I will put the second HD back and rebuid RAID 1. In case something is awfuly wrong I will use my backup disk as a primary one and rebuild old RAID structure with 3.3. Has anyone performed similiar upgrade in that way? I assume RAID is independent, hardware solution, so it should not influence system behaviour during installation. Am I right or CCM will complain?