Troubleshooting
===============
 - If re-installed, there is some leftovers from LVM/Device Mapper causing CentOS installer
 to crash (even if 'clearpart' is specified). After first crash, it may be useful.
    * Clean partition tables with
        dd if=/dev/zero of=/dev/<device> bs=512 count=1024
    * Destroy rogue LVM VGs
        vgdestroy <vgname>
    * Destroy rogue device mapper devices
        dmsetup info -C
        dmsetup remove_all
        dmsetup remove <name>