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

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

[Marco Gaiarin]

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?


Thanks.

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

[Gilou]

Le 17/09/2025 à 15:27, Marco Gaiarin a écrit :
> 
> 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?
Hi,

What's the underlying storage? local zfs?
Does it have thin provisioning / sparse enabled?

You can check that forum post: 
https://forum.proxmox.com/threads/zfs-enable-thin-provisioning.41549/

Also inside the VM, make sure that all the stack is discard aware, LVM, 
filesystem and all..

Regards,
Gilou

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

[Alwin Antreich via pve-user]

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From: "Alwin Antreich" <alwin@antreich.com>
To: "Proxmox VE user list" <pve-user@lists.proxmox.com>
Subject: Re: [PVE-User] Analysis of free space...
Date: Thu, 18 Sep 2025 13:44:04 +0000
Message-ID: <63783ca5c3f39fab913e615393ceea9c55bf147e@antreich.com>

Hi Marco,


September 17, 2025 at 3:27 PM, "Marco Gaiarin" <gaio@lilliput.linux.it mailto:gaio@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

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