Every time I have to do this, I have to google the guide, and I'm tired of that, so I did it here. The main source I like is this: How to enlarge an EXT4 or LVM disk on an Ubuntu Proxmox VM and also this Resize Ubuntu VM disk
In Promxox, go to the VM, click “Hardware”, select the disk, click the “Disk Action” menu at the top, and choose “Resize.” Configure how much space you want to add, and click OK.
Do “lsblk” to make sure you know the path of the drive you are expanding ( usually /dev/sda ). Take note of the actual partition of the Logical Volume (sda3 here)
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 161G 0 disk
sda1 8:1 0 1M 0 part
sda2 8:2 0 2G 0 part /boot
sda3 8:3 0 159G 0 part
ubuntu--vg-ubuntu--lv 253:0 0 63.5G 0 lvm /
sr0 11:0 1 1024M 0 rom
Do “parted /dev/sda” (changing the drive path if it needs to be different)
When parted starts, type “print” which will bring up a warning “Not all of the space available to /dev/sda appears to be used, you can fix the GPT to use all of the space (an extra 146800640 blocks) or continue with the current setting?” Make sure to Fix by typing “Fix” and hitting Enter.
You will see some output after this, listing multiple drives. We're specifically looking for an LVM partition, which will not be bios_grub or ext4. Here is an example:
(parted) print Model: QEMU QEMU HARDDISK (scsi) Disk /dev/sda: 173GB Sector size (logical/physical): 512B/512B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags 1 1049kB 2097kB 1049kB bios_grub 2 2097kB 2150MB 2147MB ext4 3 2150MB 139GB 136GB
You need to do “resizepart” for the correct partition, in this case, it's “resizepart 3”. When prompted to confirm, type “100%” to ensure you're using all space, then hit Enter.
Finally enter “quit” to exit parted.
fdisk -l # Check the free space on the disk growpart /dev/sda 3 # Now, grow the partition pvdisplay # Display information about the physical drive pvresize /dev/sda3 # Instruct LVM that the disk size has changed pvdisplay # Confirm the physical drive layout has changed lvdisplay # View the logical volume, and confirm the LV name for the next step lvextend -l +100%FREE /dev/ubuntu_vg/ubuntu_lv # Resize the logical volume lvdisplay # Confirm the logical volume is bigger resize2fs /dev/mapper/ubuntu_vg-ubuntu_lv # Resize the actual filesystem fdisk -l # Confirm the new drive size