[SOLVED] Trim VM data, too big backups

[Ivan Gersi]

I have node (ext4) with several VM machine. One VM is Debian with 1.4TB disk (Ide, raw). Backup of this machine have still over 1TB despite the fact VM has already only 400GB data.
I`ve tried to use trim(fstrim) with this result (discard is checked on VM`s disk).
root@pve6:~# fstrim -av
/var/lib/vz: 2.2 MiB (2314240 bytes) trimmed on /dev/mapper/pve-vz
VM machine.

Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       1.4T  431G  926G  32% /
udev             10M     0   10M   0% /dev
tmpfs           1.6G  171M  1.4G  11% /run
tmpfs           4.0G  4.0K  4.0G   1% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           4.0G     0  4.0G   0% /sys/fs/cgroup

Next backup has 1.03TB.
How can I save backup size in this VM?

 

[LnxBil]

It looks like you ran fstrim on the PVE host pve6 and not inside of your VM.

 

[Ivan Gersi]

Of course I did it on node. not on VM. I thought I have to do it this way.
Mea culpa.
Now it seem to be ok.
fstrim -av
/: 939.8 GiB (1009099677696 bytes) trimmed