This walk-through worked on a virtual server running RHEL 6.7 in a VMware environment.
As I rebuilt an existing VMware guest that was being scheduled to go into production, I realized I did not rename the default volume group from vg_hostname to rootvg.
You must be root user and it is extremely important to backup the files below. It’s also important to know how to boot up in rescue mode with other boot media in the event there was a typo or other unforeseen issue.
Backup fstab file
cp /etc/fstab /etc/fstab.orig
Backup grub.conf file
cp /boot/grub/grub.conf /boot/grub/grub.conf.orig
Rename volume group
vgrename /dev/vg_OLDname /dev/rootvg
Change all instances of the old volume group in the following files:
Edit /etc/grub.conf (which is a symbolic link to /boot/grub/grub.conf)
vim /etc/grub.conf
Search and replace
:%s/vg_OLDname/rootvg/g
Edit fstab file
vim /etc/fstab
Search and replace
:%s/vg_OLDname/rootvg/g
Move boot image
mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r).img.backup
dracut -v /boot/initramfs-$(uname -r).img $(uname -r)
Verify your work
Reboot
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