[PVE-User] Thin LVM showing more used space than expected

[Martin Holub]

Am 28.12.2022 um 12:44 schrieb Óscar de Arriba:
> Hi Martin,
>
> > Did you try to run a fstrim on the VMs to regain the allocated 
> space? At least on linux something like "fstrim -av" should do the trick.
>
> I did it now and it freed ~55GiB of a running isntance (the one with 
> 128 GiB allocated). However that should only free blocks of the LV 
> used to store that VM disk, right? And the issue itself is that the 
> sum of maximum allocations of those disks is much lower than the space 
> occupied.
>
> I also have the feeling that those blocks remain used by a no longer 
> existant LVs, but I don't know how to fix it.
>
> Should I also enable trim/execute trim on Proxmox itself?
>
> Oscar
>

Hi,

TRIM only works on a filesystem level, so you can't trim a VG or 
similar. On the pve host i doubt it will help, but it wouldn't harm either.

hth
Martin