Centos 7 : Guide to increace /dev/mapper/root on Centos 7

Guide to increace /dev/mapper/root on Centos 7


1. backup all data in /home

- #tar -czvf /root/home.tgz -C /home .
- test backup : #tar -tvf /root/home.tgz

2. unmount home

- #df-h
- #umount /dev/mapper/centos-home

3. remove the home logical volume

- #lvremove /dev/mapper/centos-home

4.recreate a new (400GB) logical volume for /home, format and mount it

- #lvcreate -L 400GB -n home centos
- #mkfs.xfs /dev/centos/home
- #mount /dev/mapper/centos-home

5.extend /root volume with ALL of the remaining space and resize (-r) the file system while doing so

- #lvextend -r -l +100%FREE /dev/mapper/centos-root
- #df -h

6.restore your backup

- #tar -xzvf /root/home.tgz -C /home