I have the same partiotioning on one server.
I've used 4.0 RC1, because it is AMD64.
It boots properly.
I have installed GRUB into partition, not into mbr.
/root/anaconda-ks.cfg:
bootloader --location=partition --append="rhgb quiet"
# The following is the partition information you requested
# Note that any partitions you deleted are not expressed
# here so unless you clear all partitions first, this is
# not guaranteed to work
#part raid.18 --size=150 --ondisk=sda --asprimary
#part raid.19 --size=150 --ondisk=sdb --asprimary
#part raid.21 --size=100 --grow --ondisk=sdb
#part raid.20 --size=100 --grow --ondisk=sda
#raid /boot --fstype ext3 --level=RAID1 raid.18 raid.19
#raid pv.23 --fstype physical volume (LVM) --level=RAID1 raid.20 raid.21
#volgroup VolGroup00 --pesize=32768 pv.23
#logvol / --fstype ext3 --name=LogVol00 --vgname=VolGroup00 --size=10240
#logvol swap --fstype swap --name=LogVol01 --vgname=VolGroup00 --size=2048
#logvol /var --fstype ext3 --name=LogVol02 --vgname=VolGroup00 --size=4096
#logvol /tmp --fstype ext3 --name=LogVol03 --vgname=VolGroup00 --size=4096
#logvol /home --fstype ext3 --name=LogVol04 --vgname=VolGroup00 --size=2048
#logvol /rest --fstype ext3 --name=LogVol05 --vgname=VolGroup00 --size=129888
--
Sincerely
Ivo Panacek
