Expanding LVM PVs and LVs

Apr 26, 2024

I’m writing this down because I keep having to expand disks in PVE, but can’t remember the commands for the guest and keep having to google it.

  1. Extend the disk in PVE by however much
  2. Use fdisk to expand (really, delete then recreate) the partition 
    # fdisk /dev/vda
Command: p
Disk /dev/vda: 192 GiB, 206158430208 bytes, 402653184 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 2283D992-048D-407F-A13C-63AFDA9CC224

Device       Start       End   Sectors  Size Type
/dev/vda1     2048   1050623   1048576  512M EFI System
/dev/vda2  1050624   2050047    999424  488M Linux filesystem
/dev/vda3  2050048 201324543 199274496   95G Linux filesystem

Command: d
Partition number (1-3, default 3):

Partition 3 has been deleted.

Command: n
Partition number (3-128, default 3):
First sector (2050048-402653150, default 2050048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2050048-402653150, default 402651135):

Created a new partition 3 of type 'Linux filesystem' and of size 191 GiB.
Partition #3 contains a LVM2_member signature.

Do you want to remove the signature? [Y]es/[N]o: n

Command:  w
The partition table has been altered.
Syncing disks.
  3. Extend the PV 
    # pvresize /dev/vda3
Physical volume "/dev/vda3" changed
1 physical volume(s) resized or updated / 0 physical volume(s) not resized
  4. Extend the LV 
    # lvresize -l +100%FREE /dev/mapper/vaermina--vg-root
Size of logical volume vaermina-vg/root changed from <95.02 GiB (24325 extents) to <191.02 GiB (48901 extents).
Logical volume vaermina-vg/root successfully resized.
  5. Extend the ext4 partition 
    # resize2fs /dev/mapper/vaermina--vg-root
resize2fs 1.47.0 (5-Feb-2023)
Filesystem at /dev/mapper/vaermina--vg-root is mounted on /; on-line resizing required
old_desc_blocks = 12, new_desc_blocks = 24
The filesystem on /dev/mapper/vaermina--vg-root is now 50074624 (4k) blocks long.