[CentOS] How to create LVM after Centos installation

Hello all,

I wanted to create a Raid0 partition using LVM based on 2 LUNs
available;  I was unable to find an LVM GUI selection in the
System->Adminsitration selection in the gui .... system-config-lvm is
not available.

What am I missing during the installation?

thanks in advance,

-- 
best,

Vince