  No.  It was unclear from your comment whether you had actually been able to install it or not - if you had, then RAID must be configured already, at least for that array.  Your array with the 2TB disks will NOT interfere in any way with what you have done with your 146GB RAID 1 array.   POST = Power On Self Test[URL] BIOS = Accessed by hitting F2 during POST (prompt appears in upper-right corner of the screen).  This displays system settings for built-in hardware, time, virtualization, etc. Because the drives are connected to the PERC RAID controller card, you will not see them listed in the BIOS.  You must enter the controller card's configuration utility (CTRL-R) to see drives that are connected to the controller (to the system connected by the backplane).  You must watch the screen and wait for the controller to load during POST, then you will see a prompt to hit CTRL-R to enter the controller's configuration utility.  (POST contains many prompts to enter configuration utilities for several different devices - the RAID controller, network boot settings, DRAC, BMC, etc.)  
Hi all, I have a 2950 that I am installing 14.02 unbuntu on and it has 5 drives.  (2) drive are 146GB and the (3) drives are 2TB.  I went in the BIOS and I didn't see the drives listed.  Ubuntu was installing on the 146GB drives that are mirroring.   Drives are in the following slot: 146GB: Slot 0 single green light on top146GB: Slot 1 single green light on top2 TB: Slot 2 single green light on top2 TB: Slot 3 dual  green lights3 TB: Slot 4 dual green lightsempty: slot 5 Anyone know as to why I can't see the 2TB drives or know any troubleshooting ideas?  Thanks in advance!
Dell 2950 Hard drive issue?