Renaming The Volume Group Containing /

Almost every server I work with is a virtual machine;  accordingly I like to do one small install with all the packages that I always want [like pam-nss-ldapd, snmp-utils, dstat, etc...] but don't install by default.  Then I make sure VMware tools is installed an operational.  From that point forward I can just clone that one VM and add to it when I want a new instance of something.
The only downside to this is that all the machines end up with the same volume group name: typically VolGroup0 or some such thing.  That's ugly and limits the ability to move volume groups around - these are virtual disks after all.  Renaming a volume group is straight forward:

vgrename /dev/VolGroup0  /dev/Carazon
Text 1: Rename the volume group VolGroup0 to be named Carazon.

 Hold it!  Now the machine won't boot anymore!  You get the pleasure of rebooting into "Kernel Panic:  blah blah blah".  If you rename the volume group containing the root filesystem and swap space you also have to update that name in two places -

1. In /etc/fstab.  This one is obvious and I usually remember.
2. In /etc/grub.conf.  Otherwise the kernel tries to mount the root file-system using the old volume group name.

Done this so many times... always forget.