[CentOS] Problem selecting installation drive : 5.2

[Alex H. Vandenham]

When doing the 5.2 installation the ONLY drive option provided is

mapper/nvidia_cbjcdhfe (250G)

My system has 2 SATA - 250G drives and I  want to use them in a RAID/LVM 
configuration.  

My question: 

How do I get the installer to let me use DiskDruid to create RAID1 arrays and 
then use LVM for the mount points?

What I've done so far:

I've verified that both drives are recognized by going to the shell screen and 
using fdisk to access both /dev/sda and /dev/sdb - so I know they are both 
available.

I've also tried using the Centos 4.7 installer where I can do exactly what I 
want.

I've accepted the default and after a full install of 5.2 there is no raid and 
total space is 250G.

I've looked at the various deployment guides and installation guides but can't 
find how to do this . . . . 

puzzled

Alex
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