[linux-lvm] How to rename a VG that contains the root?

[d3yuen at artsmail.uwaterloo.ca]

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), 
but i don't remember how to do that too..  


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?




Any suggestions is very greatly appreciated.


Thanks very much, 
/dky