[PVE-User] Feature request : warning / error on migration if target storage doesn't have enough size

[PVE-User] Feature request : warning / error on migration if target storage doesn't have enough size

[Guillaume VANDENHOVE]

Hello, 

When migrating a VM (or a container) from one node to another, I miscalculated the remaining empty space on my target node, and ended up with a completely full disk, which is obviously not something you want. 

Proxmox already issue warnings like "large storage, migrating may take a while", and it can also issue blocking errors, like "local CD attached to VM". Adding a check of [current VM size] vs [remaining space on target dataset] would be helpful, and a good way to avoid shooting yourself in the foot (which proxmox usually does pretty well). There could be a warning when the target dataset will be almost entirely filled (>97% usage), and an error when the target dataset isn't big enough to migrate the VM. 

I'm sorry if this is not the correct place to report this, but I didn't see any "feature request" subforum on the proxmox forum.

Regards, 

Guillaume Vandenhove



_______________________________________________
pve-user mailing list
pve-user@lists.proxmox.com
https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user

Re: [PVE-User] Feature request : warning / error on migration if target storage doesn't have enough size

[Eneko Lacunza via pve-user]

[-- Attachment #1: Type: message/rfc822, Size: 7168 bytes --]

From: Eneko Lacunza <elacunza@binovo.es>
To: pve-user@lists.proxmox.com
Subject: Re: [PVE-User] Feature request : warning / error on migration if target storage doesn't have enough size
Date: Wed, 14 Jan 2026 09:53:02 +0100
Message-ID: <47f7fa71-68d0-4b57-9187-d8674622aa50@binovo.es>

Hi Guillaume,

Something like you said could be helpful, but some storages have thin 
provisioning+deduplication and Proxmox may not be able to determine 
effective disk size; so I don't think a hard error would be possible 
always (it could prevent migrating VMs that have enough space in 
destination although not being evident...

Regards

El 13/1/26 a las 15:59, Guillaume VANDENHOVE escribió:
> Hello,
>
> When migrating a VM (or a container) from one node to another, I miscalculated the remaining empty space on my target node, and ended up with a completely full disk, which is obviously not something you want.
>
> Proxmox already issue warnings like "large storage, migrating may take a while", and it can also issue blocking errors, like "local CD attached to VM". Adding a check of [current VM size] vs [remaining space on target dataset] would be helpful, and a good way to avoid shooting yourself in the foot (which proxmox usually does pretty well). There could be a warning when the target dataset will be almost entirely filled (>97% usage), and an error when the target dataset isn't big enough to migrate the VM.
>
> I'm sorry if this is not the correct place to report this, but I didn't see any "feature request" subforum on the proxmox forum.
>
> Regards,
>
> Guillaume Vandenhove
>
>
>
> _______________________________________________
> pve-user mailing list
> pve-user@lists.proxmox.com
> https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user
>

Eneko Lacunza
Zuzendari teknikoa | Director técnico
Binovo IT Human Project

Tel. +34 943 569 206 | https://www.binovo.es
Astigarragako Bidea, 2 - 2º izda. Oficina 10-11, 20180 Oiartzun

https://www.youtube.com/user/CANALBINOVO
https://www.linkedin.com/company/37269706/



[-- Attachment #2: Type: text/plain, Size: 157 bytes --]

_______________________________________________
pve-user mailing list
pve-user@lists.proxmox.com
https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user