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I am trying to double the size of my root filesystem shown below:

# df Filesystem 1K-blocks Used Available Use% Mounted on devtmpfs 98162476 0 98162476 0% /dev tmpfs 98193220 84 98193136 1% /dev/shm tmpfs 98193220 18992 98174228 1% /run tmpfs 98193220 0 98193220 0% /sys/fs/cgroup /dev/mapper/rhel-root 73364480 24938064 48426416 34% / /dev/mapper/rhel-home 389482692 2748736 386733956 1% /home /dev/sda1 1038336 265924 772412 26% /boot tmpfs 19638644 0 19638644 0% /run/user/0 shm 64000 16 63984 1% /var/lib/containers/storage/overlay-containers/... 73364480 24938064 48426416 34% /var/lib/containers/storage/overlay.../merged overlay 73364480 24938064 48426416 34% /var/lib/containers/storage/overlay/.../merged overlay 73364480 24938064 48426416 34% /var/lib/containers/storage/overlay/.../merged overlay 73364480 24938064 48426416 34% /var/lib/containers/storage/overlay/.../merged overlay 73364480 24938064 48426416 34% /var/lib/containers/storage/overlay/.../merged 
# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 446.6G 0 disk ├─sda1 8:1 0 1G 0 part /boot └─sda2 8:2 0 445.6G 0 part ├─rhel-root 253:0 0 70G 0 lvm / ├─rhel-swap 253:1 0 4G 0 lvm [SWAP] └─rhel-home 253:2 0 371.6G 0 lvm /home

I see I have plenty of free space in rhel-home, so I am guessing it must be possible to re-purpose some of that space in rhel-root (ideally about 70gs). However I don't really understand filesystems enough to know if this is more complicated that it seems.

The answers I have found on this quickly get to a point that something goes over my head. What is the best way to achieve what I am trying to do, ideally without losing any data in either filesystem (but not the end of the world if it is not possible without potentially losing some data)

# resize2fs /dev/mapper/rhel-home 300GB resize2fs 1.45.6 (20-Mar-2020) resize2fs: Bad magic number in super-block while trying to open /dev/mapper/rhel-home Couldn't find valid filesystem superblock.
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    perhaps your /home is not a ext2/3/4 filesystem? Commented Jan 31, 2023 at 2:09
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    what I don't understand though ... df and lsblk show /dev/mapper/rhel-home - but you try to resize /dev/mapper/rhel_wsfd--advnetlab04-home Commented Jan 31, 2023 at 2:45

1 Answer 1

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  1. create /home.new as root 'mkdir /home.new'
  2. Copy /home to /home.new (in your root filesystem) 'cp -prv /home /home.new'
  3. login through your console, cd /, become root 'sudo su -'
  4. clean out /home 'rm -rfv /home'
  5. dismount /home 'umount /home'
  6. rename /home /home.old 'mv -v /home /home.old'
  7. rename /home.new => /home 'mv -v /home.new /home'
  8. remove (or comment out) /home from your /etc/fstab 'nano /etc/fstab'
  9. cross fingers, reboot and login as root in rescue mode
  10. delete your /home lvm (lvremove)
  11. lvm lvextend -l +100%FREE /dev/mapper/rhel-root
  12. resize2fs -f /dev/mapper/rhel-root

Good luck.

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