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# Tested on RHEL 6 & 7 # Carry out planned modifications: renaming the existing Volume Group and/or renaming # the Logical Volume(s). I just wanted to change the name of all LVs belonging to rootvg: lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert home rootvg -wi-ao---- 512.00m opt rootvg -wi-ao---- 1.00g root rootvg -wi-ao---- 1.00g swap rootvg -wi-ao---- 1.00g tmp rootvg -wi-ao---- 1.00g usr rootvg -wi-ao---- 1.00g var rootvg -wi-ao---- 1.00g lvrename /dev/rootvg/home lv_home lvrename /dev/rootvg/opt lv_opt [...] lvrename /dev/rootvg/usr lv_usr lvrename /dev/rootvg/var lv_var # Update /etc/fstab with the new names /dev/mapper/rootvg-lv_root / ext4 defaults 1 1 /dev/mapper/rootvg-lv_swap swap swap defaults 0 0 [...] # and then... # RHEL 6 ----------------------------------------------------------------------------------- # Update VG/LV names in /boot/grub/grub.conf vi /boot/grub/grub.conf [...] kernel /vmlinuz-2.6.32-358.el6.i686 ro root=/dev/mapper/rootvg-lv_root rd_NO_LUKS [...] shutdown -r now # RHEL 7 ----------------------------------------------------------------------------------- # Update VG/LV names in /etc/default/grub vi /etc/default/grub [...] GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=rootvg/lv_root rd.lvm.lv=rootvg/lv_swap rd.lvm.lv=rootvg/lv_usr rhgb quiet" [...] # Then reboot the system to rescue mode (I used a RHEL 7 rescue cd, option "find Linux # installation and mount under /mnt/sysimage") and rebuild grub2 using following procedure: # vgchange -ay rootvg # mount /dev/sda1 /mnt/sysimage/boot # mount /dev/rootvg/lv_usr /mnt/sysimage/usr chroot /mnt/sysimage grub2-mkconfig -o /boot/grub2/grub2.cfg exit shutdown -r now |