Accidentally Added Extra Disk Space to Proxmox VM, Need to Reduce It (LVM Setup)

A

abhijith

New Member
Dec 1, 2024
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Hi Everyone,

I'm new to Proxmox and recently ran into an issue with disk management. Here's the situation:

I created an Ubuntu 24 server VM with an initial disk size of 150 GB. Later, I realized I needed to add an additional 25 GB, but I accidentally extended the disk by 175 GB, bringing the total size to 325 GB.

The issue is that I haven’t allocated the extra disk space to the VM's filesystem yet, but now I need to reduce the disk size back to the correct size.

Here’s some additional info about my setup:

  • LVM is used for the volume management.
  • Below are the outputs of df -h and lsblk commands:

    df -h:


  • Filesystem Size Used Avail Use% Mounted on
    tmpfs 2.0G 8.5M 2.0G 1% /run
    efivarfs 256K 94K 157K 38% /sys/firmware/efi/efivars
    /dev/mapper/ubuntu--vg-lv--0 145G 111G 27G 81% /
    tmpfs 10G 0 10G 0% /dev/shm
    tmpfs 5.0M 0 5.0M 0% /run/lock
    /dev/sda2 2.0G 183M 1.7G 10% /boot
    /dev/sda1 1.1G 6.2M 1.1G 1% /boot/efi


    lsblk:


  • NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
    sda 8:0 0 325G 0 disk
    ├─sda1 8:1 0 1G 0 part /boot/efi
    ├─sda2 8:2 0 2G 0 part /boot
    └─sda3 8:3 0 146.9G 0 part
    └─ubuntu--vg-lv--0 252:0 0 146.9G 0 lvm /
    sr0 11:0 1 2.6G 0 rom



  • What I Need Help With:
    1. Is it possible to reduce the size of the disk back to the desired size (175 GB or 150 GB)?
    2. If yes, what is the safest way to achieve this without affecting the data in the VM?
    3. Any specific steps for LVM would be greatly appreciated.
  • I understand resizing can be risky, so I’m being cautious here and asking for advice before proceeding.

    Thanks in advance for your guidance!
 
> Is it possible to reduce the size of the disk back to the desired size (175 GB or 150 GB)?

No. Since this is thin-provisioned, you can limit the partition size in-vm and it will never grow to reach the outside size limit. Make a note of it in your config.

If you're detail-oriented and reeeeaally need to fix the overall outside disk size, you'll need to create a new vdisk of the appropriate size, attach it, copy everything over, detach the original oversized disk. Might not be worth the effort.
 
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