I have a server that has four 80 GB hard drives set up in RAID 5....in 2 partitions C and D. C being OS and D being data to include exchange stores. I want to add 3 more 80 GB hard drives and one hot spare. These are dell poweredge 2900, SBS 2003 and i am useing the PERC 5/i Raid controller. I believe that this setup supports adding these disks while the machine is up and running. I also believe that i can add these three disks through Dell's open manage software. Can i allot these this added disk space right to the D partition thought open manage without having to move data around? I did buy Paragon Partition Manager so i do have a third party software package if need be. What do i need to do prior to adding these disks? I know i should take a full backup. I am using backup exec and it seems to not want to backup my mailbox stores, what is the best way to back those up/get a full backup? Lastly how do i set up a hot spare?