How to rename a VG that contains the root?

Hello!


I'd like to change the name of a volume group that contains the root
partition.  I spent some time searching on google for some notes that ,
but to no avail.  So i looked at the man page for vgrename and renamed my
volume group.  I changed entries in both fstab and grub.conf, but now the
machine wouldn't boot. The machine boots to a point and then i see this
error message:

Freeing unused kernel memory: 
Kernel panic: No init found.  Try passing init= option to kernel.  

I suspect that i need to reinstall (reload?) the boot loader (i use grub), 
and I've tried that but to no avail.  (i did a grub-install)

I'm a bit lost -- could someone tell me what is the proper procedure to 
change the name of a volume group, please?  

What should i keep in mind if i needed to change the name of a volume
group that contains root?

I'm running RedHat Enterprise Linux AS v.3, on the latest errata kernel


Any suggestions is very greatly appreciated.


Thanks very much, 
/dky
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