I've got a server with 16 1TB SATA drives in it. It was set as a single RAID5 volume. Unfortunately, Windows was showing two unallocated volumes during the windows setup, one as 2TB, and then the rest. I've been unable to figure out how I can utilize these volumes in the correct manner. The vision was to have two partitions:
100GB - OS Rest - Backup 2 Disk Partition
After calling HP, they wanted me to RAID1 two disks for the OS and then use the remaining disks in a RAID5 config. Once in Windows convert the RAID5 volume to GTP. However, this completely wastes a lot of space on the OS volume.