Luis, backup the data on the machine just in case then put the other 4 disks in. they should all be identical to each other, or identical in pairs. (our preference) they do not have to be identical to the first pair... reboot and deal with the HP hardware raid controller setup of the disks i do not believe you will be able to "hardware" raid 1+0 the the 4 disks together using the HP setup in BIOS i believe you will have to do it as qty (2) more RAID 1+0 pairs, yet you can look and see. you could hardware RAID5 the other 4 as well. it all depends on what the HP hardware controller allows you to do and it will tell you easily and plainly. again, make sure you backup your data first. - rh -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20090909/6d8b5ca4/attachment-0004.html>