rename volume group of the root partition

https://bugzilla.redhat.com/show_bug.cgi?id=230190
the above doc has some errors. What worked is below:

1. Boot into rescue mode (no searching of installation -> skip)

2. Scan for LVM-VG's -> lvm vgscan

3. Check to not have activ lvm in kernel -> lvm vgchange -a n

4. Rename VG -> lvm vgrename VolGroup00 VG00

5. Again, scan for VG's -> lvm vgscan

6. Activate lvm -> lvm vgchange -a y

7. Create directorys for mounting -> mkdir /mnt/sysimage/

8. Mount root-Logical Volume -> mount /dev/VolGroup00/LogVol00 /mnt/sysimage

9. Mount boot-partition -> mount /dev/cciss/c0d0p1 /mnt/sysimage/boot

10. make /dev/root: mknod /dev/root b $(lvm lvdisplay -C --noheadings --separator " " --options

lv_kernel_major,lv_kernel_minor VolGroup00/LogVol00 )

11. Mount /dev -> mount -o bind /dev /mnt/sysimage/dev

12. Change to new root -> chroot /mnt/sysimage

13. Remount /proc and /sys

14. Change VolGroup00 to VG00 in /boot/grub.conf and /etc/fstab

15. Creating new initrd -> mkinitrd -f -v /boot/initrd-xyz.img xyz

16. make sure the default in /boot/grub/grub.conf refers to the entry with /boot/initrd-xyz.img

17. exit

18. umount partitions

19. sync;sync;sync;exit