Yrurtj

I have a laptop with Arch on it, and I sized the root partition too small. Now I want to expand the partition by taking some from the home partition. I will put the details of the specifics below. My question(s) to you is

1) Am I just expanding the root? Or shrinking the home? Or is it both? If both then does order matter? I see several online tuts that sort of do them different ways. So it's confusing to me.

2) Should I follow the arch documentation exactly? It's not like other tuts I've seen which may not be distro specific. Also asking because it mentions things like make a new partition under expand, but never says anything about what to do with the old one. It would be great if you could explain this if the answer is yes.

3) Do I need to update my fstab afterwards?

4) If all goes well, I should still have my data on these partitions right? Obviously I'm backing up just to be sure.

Here are my specific details:

> df -h

Filesystem               Size  Used Avail Use% Mounted on

dev                      7.7G     0  7.7G   0% /dev

run                      7.7G  1.2M  7.7G   1% /run

/dev/mapper/archvg-root  9.8G  9.3G     0 100% /

tmpfs                    7.7G  723M  7.0G  10% /dev/shm

tmpfs                    7.7G     0  7.7G   0% /sys/fs/cgroup

tmpfs                    7.7G   16K  7.7G   1% /tmp

/dev/nvme0n1p1           749M   62M  688M   9% /boot

/dev/mapper/archvg-home  456G  3.0G  430G   1% /home

tmpfs                    1.6G   16K  1.6G   1% /run/user/1000

/dev/fuse                250G   78M  250G   1% /run/user/1000/keybase/kbfs



> lsblk

NAME              MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT

nvme0n1           259:0    0   477G  0 disk

├─nvme0n1p1       259:1    0   750M  0 part  /boot

└─nvme0n1p2       259:2    0 476.2G  0 part

  └─archlv        254:0    0 476.2G  0 crypt

    ├─archvg-swap 254:1    0     2G  0 lvm   [SWAP]

    ├─archvg-root 254:2    0    10G  0 lvm   /

    └─archvg-home 254:3    0 464.2G  0 lvm   /home



> sudo pvdisplay -m

  --- Physical volume ---

  PV Name               /dev/mapper/archlv

  VG Name               archvg

  PV Size               476.20 GiB / not usable <1.32 MiB

  Allocatable           yes (but full)

  PE Size               4.00 MiB

  Total PE              121908

  Free PE               0

  Allocated PE          121908

  PV UUID               m11dPA-mPYo-6dLS-mXPF-V1Ww-jXuO-QXfB8e



  --- Physical Segments ---

  Physical extent 0 to 511:

    Logical volume      /dev/archvg/swap

    Logical extents     0 to 511

  Physical extent 512 to 3071:

    Logical volume      /dev/archvg/root

    Logical extents     0 to 2559

  Physical extent 3072 to 121907:

    Logical volume      /dev/archvg/home

Logical extents 0 to 118835

Here is the steps I plan on taking

Boot from a live USB



# Step 1: Clone the current partition to a new partition

> dd if=/dev/mapper/archvg-root of=/dev/mapper/archvg2-root bs=4M



# Step 2: Extend the new partition

> cryptsetup open /dev/mapper/archvg2-root archlv



# Step 3: Enlarge the PV to use all the available remaining space of the partition

> pvresize /dev/mapper/archlv



## Review

> pvdisplay -m



# Step 4: Resize /home Logical Volume (trying to make it 100G)

> lvresize -L +90.2G /dev/CryptVolumeGroup/root



## Review

> pvdisplay -m



# Step 5: Resize encrypted volume (Trying to give it some space)

> resize2fs -p /dev/CryptVolumeGroup/root 101G



# Reboot

Here are other references of other's doing this differently which I'm still looking into if they have better methods or not.

• 
  https://serverfault.com/questions/394902/resizing-a-luks-encrypted-volume (He's unmounting, not mentioned in Arch docs. Not sure I need to)


• Extend a LUKS encrypted partition to fill disk


• 
  https://blog.tinned-software.net/increase-the-size-of-a-luks-encrypted-partition/ (seems like less steps)

If more detailed information about the specifics is helpful, please let me know and I'll update this with them.