Rebel6974
You do need to confirm you hardware (motherboard chipset etc) is compatible with CentOS 6.7
see
https://wiki.contribs.org/SME_Server:9.1Also if reusing disks you need to erase the MBR on all drives.
You can boot up to the SME server CD/DVD/USB, then erase the drives, then reboot from CD/DVD/USB & install SME server.
See
https://wiki.contribs.org/Raid#Reusing_Hard_DrivesWhich says:
If it (a drive) was ever installed on a Windows machine (or in some cases an old (Linux) system) then you will need to clear the MBR first before installing it.
From the linux command prompt, type the following:
dd if=/dev/zero of=/dev/sdx bs=512 count=1
where sdx is the location of each drive eg sda sdb etc