I have a server at a client with a six-drive RAID 5 array that was recently upgraded from 250GB disks to 1TB disks. The server was--for various reasons--configured during its initial install years ago with a single partition (C:) for both the OS and data partitions. A Dell PERC/5i running firmware version 5.0.2-0003 handles the array and there a single virtual disk on the controller formatted as a MBR disk.
Long story short, I need to find some way to convert the disk to GPT so I can access the entire 4TB (one drive is a hot spare) of usable space through a single drive letter. I realize this can't be done on an active OS partition. I'm not against splitting the OS and data into separate partitions, but I'm looking for advice on how to do this without backing up the entire server and doing a fresh install with brand new partitions. Perhaps there is some way to use the PERC management tools to split off some of the physical disks from the existing array into new virtual disks without losing any existing data? Any ideas would be appreciated, thanks!