---
Title: Resize disks
Description: Some useful notes of resizing disks for VMs.
---
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###### tags: Notes, DevOps
*ref: https://pve.proxmox.com/wiki/Resize_disks*
*ref: https://www.humblec.com/is-it-possible-to-do-online-resizing-of-guest-block-devices-or-without-shutdown/*
## Resize guest disk
(for Proxmox VE)

qm resize <vmid> <disk> <size> 

(for virsh)

virsh blockresize <vm-name> <image-path> --size <size>

## Enlarge the partition(s) in the virtual disk
### Online for Linux Guests
:::warning
Note that the partition you want to enlarge should be at the end of the disk.
:::
Check that the kernel has detected the change of the hard drive size
(here we use VirtIO so the hard drive is named vda)

dmesg | grep vda

Print the current partition table

fdisk -l /dev/vda | grep ^/dev

Resize the partition 3 (LVM PV) to occupy the whole remaining space of the hard drive)

parted /dev/vda
(parted) print
Warning: Not all of the space available to /dev/vda appears to be used, you can
fix the GPT to use all of the space (an extra 268435456 blocks) or continue
with the current setting? 
Fix/Ignore? F 

(parted) resizepart 3 100%
(parted) quit

Check partition table

fdisk -l /dev/vda | grep ^/dev

## Check volume size

df -h

should look like:

root@nanako-vm:/home/nanako# df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                               6.8G     0  6.8G   0% /dev
tmpfs                              1.2G  1.7M  1.2G   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv   31G   30G     0 100% /

`/dev/mapper/ubuntu--vg-ubuntu--lv` is the volume path we want to resize

## Enlarge the filesystem(s) in the partitions on the virtual disk
### Online for Linux guests with LVM
Enlarge the physical volume to occupy the whole available space in the partition:

pvresize /dev/vda3

Enlarge the ==**logical volume**== and the ==**filesystem**== (the file system can be mounted, works with ext4 and xfs)

- expand for 20GB

lvresize --size +20G --resizefs /dev/mapper/ubuntu--vg-ubuntu--lv

- expand for 100% free space

lvresize --extents +100%FREE --resizefs  /dev/mapper/ubuntu--vg-ubuntu--lv

:::info
if you get error like this:

**`/etc/lvm/archive: mkdir failed: No space left on device`**

you can add args `-A n` to turn off auto-backup of metadata.
:::

### without LVM
last step to apply new space to file system

resize2fs -f /dev/mapper/ubuntu--vg-ubuntu--lv