[PVE-User] Analysis of free space...

[Alwin Antreich]

Hi Marco,


September 17, 2025 at 3:27 PM, "Marco Gaiarin" <gaio at lilliput.linux.it mailto:gaio at lilliput.linux.it?to=%22Marco%20Gaiarin%22%20%3Cgaio%40lilliput.linux.it%3E > wrote:


> 
> We have an PVE8 server, on clustered, with 66TB of disk storage and (for
> now) a single VM; volumes have all 'discard' option enabled, and the VM
> (RH8) support and have trim enabled.
> 
> We moved around some data between volumes, and now we have 20TB used in the
> VM, and 56TB used on the zfs pool that host that volumes.
> 
> Clearly we have done some manual 'trim' to be sure, but nothing changed (or,
> better, some space get reclaimed but not what we expect).
> 
> There's some tool/methodology to find where data get stuck, and how?
> 
Are you running EXT4 on the guest?
https://forum.proxmox.com/threads/help-with-trim-on-virtio-scsi-single.123819/post-542552

Cheers,
Alwin