Manually access VM disk data


New Member
Oct 16, 2019
My data volume group has filled up to 100%. I had to forcefully stop the VMs from the commandline because they received io-error. I would like to access the filesystems within each VM and delete data. I can't figure out how to do that. Presumably they are mounted somewhere or I can mount them to cd inside? Any help is appreciated. Thanks!

I tried this and it failed:
root@vm:/tmp# mkdir /tmp/tmpvol
root@vm:/tmp# mount /dev/pve/vm-106-disk-0 /tmp/tmpvol -o ro,user
mount: wrong fs type, bad option, bad superblock on /dev/mapper/pve-vm--106--disk--0,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

For reference:

Proxmox version 5.4-3

root@vm:~# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
data pve twi-aotzD- 64.49g 100.00 3.11
root pve -wi-ao---- 29.50g
swap pve -wi-ao---- 8.00g
vm-100-disk-1 pve Vwi-aotz-- 20.00g data 34.11
vm-101-disk-1 pve Vwi-a-tz-- 10.00g data 77.98
vm-102-disk-1 pve Vwi-a-tz-- 105.26g data 9.64
vm-103-disk-1 pve Vwi-a-tz-- 10.00g data 46.33
vm-104-disk-1 pve Vwi-a-tz-- 10.00g data 34.79
vm-105-disk-0 pve Vwi-a-tz-- 40.00g data 7.44
vm-106-disk-0 pve Vwi-a-tz-- 64.00g data 44.74

root@vm:/var/lib# df -h
Filesystem Size Used Avail Use% Mounted on
udev 5.9G 0 5.9G 0% /dev
tmpfs 1.2G 115M 1.1G 10% /run
/dev/mapper/pve-root 29G 2.5G 25G 9% /
tmpfs 5.9G 43M 5.9G 1% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 5.9G 0 5.9G 0% /sys/fs/cgroup
/dev/fuse 30M 20K 30M 1% /etc/pve

root@vm:/dev# vgs
VG #PV #LV #SN Attr VSize VFree
pve 1 10 0 wz--n- 118.74g 14.75g

Storage 'local-lvm' on node 'vm' is of type LVM-Thin
Can't you boot the VM from a Live ISO and take a look at the VM disks from there?
Can't you boot the VM from a Live ISO and take a look at the VM disks from there?
Do you mean change the ISO image the VM boots from to be some linux distro live cd? I'm still not sure how I would mount those devices even inside that, or would it just show up as the available filesystem? I'm also afraid of overwriting my data.

I feel like there should be an easier solution.
Yes, assuming the disks are already assigned to the VM, booting from a Linux distro ISO should allow you to see the disks from that? If you’re worried about making any changes, better to take a backup of the underlying VM / disk image files first before making any changes?
Last edited:


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