Description of problem:
Install guide states lvm is not available in %pre when in fact it is

Version-Release number of selected component (if applicable):
RHEL 6.1 GA

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/pdf/Installation_Guide/Red_Hat_Enterprise_Linux-6-Installation_Guide-en-US.pdf
page 439
"Only the most commonly used commands are available in the pre-installation environment:
arping, awk, basename, bash, bunzip2, bzcat, cat, chattr, chgrp, chmod, chown, chroot,
chvt, clear, cp, cpio, cut, date, dd, df, dirname, dmesg, du, e2fsck, e2label, echo,
egrep, eject, env, expr, false, fdisk, fgrep, find, fsck, fsck.ext2, fsck.ext3, ftp,
grep, gunzip, gzip, hdparm, head, hostname, hwclock, ifconfig, insmod, ip, ipcalc,
kill, killall, less, ln, load_policy, login, losetup, ls, lsattr, lsmod, md5sum, mkdir,
mke2fs, mkfs.ext2, mkfs.ext3, mknod, mkswap, mktemp, modprobe, more, mount, mt, mv,
nslookup, openvt, pidof, ping, ps, pwd, readlink, rm, rmdir, rmmod, route, rpm, sed, sh,
sha1sum, sleep, sort, swapoff, swapon, sync, tail, tar, tee, telnet, top, touch, true,
tune2fs, umount, uniq, vconfig, vi, wc, wget, xargs, zcat."

Yes it is.