I am building a system that must be stigged. I let the install do what it felt like, but that resulted in a gigantic /home partition and most of the security interesting bits all being in the same volume as /. I created a smaller /home to recoup room, created new partitions to put /var, /var/log, /var/log/audit and /opt in (STIG says "do it")
lvremove vg/lv_home

lvcreate -L {sane}M -n lv_home

similar lines for the others, and formatted them from the disk manager.

I created temporary mount points for these, mounted them and ran these commands:

cd $old (where old is one of the directories mentioned)
tar -cf ../$old.tar *
cd ../$new ($new is a temporary mount point)
tar -xf ../$old.tar

I then edited fstab to include lines to mount the new partitions.

The system comes up to the splash screen and stays there, although having let it go over last night maybe it has done something. I can't check for a while.

So, boot to single user and correct fstab? Reinstall? How do people install when they know they want to STIG the system? I am mostly a BSD guy on the Linux side, so LVM is a real novelty for me.