[SOLVED] Force discard on VM disk

[molnart]

i have reorganized the content of my VM and moved some data to a separate virtual disk to have more flexibility if i ever need to increase the disk size, not touching the OS partition. now the original virtual disk has a lot of free space, but the VM still takes up ~130 GB on the local-lvm storage. Can i somehow force the discard function so that that the VM disk only uses those ~10 gigs actually used?

$ df -h /dev/vda1 /dev/vda3
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        27G  9.3G   17G  37% /
/dev/vda3        99G  1.4G   94G   2% /srv/dev-disk-by-uuid-6a783240-d831-4733-9a6c-075770839750

 

[Dunuin]

Did you try fstrim -av inside the VM? Did you check the "discard" checkbox of that VMs virtual disk?

 

[molnart]

thank you, that was exactly the command i was looking for. discard was enabled on the disk, but without running the command it did not free up the space somehow.