root partition "full"

[Cool_Fire]

I'm having an odd problem where the root partition is reported to be full but in reality is not.

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/pve-root   95G   95G     0 100% /
tmpfs                 3.9G     0  3.9G   0% /lib/init/rw
udev                  3.9G  312K  3.9G   1% /dev
tmpfs                 3.9G   13M  3.9G   1% /dev/shm
/dev/mapper/pve-data  1.7T 1013G  704G  60% /var/lib/vz
/dev/sda1             495M   85M  386M  18% /boot
/dev/sdb1             3.6T  1.9T  1.6T  55% /backup
overflow              1.0M  1.0M     0 100% /tmp
/dev/fuse              30M   64K   30M   1% /etc/pve

It tells me 95G is being used while in reality only about 1.8G is in use (according to ncdu)
I've done du/find type operations to try and locate large files but as expected with no results.
I've looked at free inodes (only 13% in use)
I've tried rebooting the node
I've done filesystem check and repair

Any ideas?

 

[masterdead]

Try this:

Create dir in for example /mnt/temp-root

mount /dev/pve/root /mnt/temp-root
du -shx /mnt/temp-root/*

The most situation, when is at to root mounted another file system like pve-data has no reporting data "under" the mount.

 

[Cool_Fire]

AH! I think this did in fact help me figure out the problem.
It seems to have made a backup to /backup at some point when the normal backup drive was not mounted so it wrote all the backup data to a folder /backup on the root partition.