Installer and Installation Process: CentOS uses the Anaconda installer, the same installer used by Fedora and several other Linux distributions. However, the version of Anaconda on CentOS 6 is at least two revisions behind the version used on Fedora 15, the latest stable edition of Fedora. It has support for LVM, RAID, and disk encryption.
The installer makes it extremely easy to configure disk encryption, and because LVM is the default disk partitioning scheme, choosing the disk encryption option and sticking with the default installation mode is the same thing as configuring encrypted LVM. Debian, Mandriva, Ubuntu (the alternate text-installer, not the Live CD version) are other Linux distributions with support for creating encrypted LVM installations.