Disk size display bug in Proxmox (unit rounding) Linux 6.8.12-12-pve (2025-07-14T13:20Z) pve-manager/8.4.5/57892e8e686cb35b

[Szymons]

Hello,
pve-manager/8.4.5/57892e8e686cb35b
Linux 6.8.12-12-pve (2025-07-14T13:20Z)

I have noticed an issue with displaying the disk size in Proxmox after adding space to an existing disk in a VM configuration. When creating the disk, the size is specified in GiB (binary units), but after adding space, there is an inconsistency between the GiB and GB units.

Here are the details:

1. The initial disk was 30,000 GiB (approximately 30 TB in decimal units).
2. After adding 720 GiB, the final disk size became 30,720 GiB.
3. However, in the Proxmox interface, the disk size is displayed as 30T (30 TB in decimal units), which is incorrect because 30 TB is 30,000 GB, not 30,720 GB.
4. In the system, the disk size shows as 32.99 TB, which is the result of a conversion between decimal (TB) and binary (TiB) units.

The issue arises because Proxmox displays the disk size in TB (decimal units) while the disk is created using GiB (binary units). This causes rounding and inconsistency in the displayed values.

In my opinion, this is a bug related to rounding or incorrect unit conversion in Proxmox, which leads to inconsistency between the actual disk size and what is displayed in the interface.

I kindly request that this bug be investigated and that the method of displaying disk sizes be corrected to match the actual values.


storage view:

VM config view

debian system view:
ls -l
-rw-r----- 1 root root 32217707118592 08-11 07:23 vm-121-disk-0.qcow2
ls -lah
-rw-r----- 1 root root 30T 08-11 07:23 vm-121-disk-0.qcow2

 

[fiona]

Hi,
the T suffix shown in the Hardware view for disks is ambiguous and is actually for TiB.

For reference: https://bugzilla.proxmox.com/show_bug.cgi?id=3900