Resize Windows disk partition in Proxmox

calendar May 17, 2024 nav_categories Tech nav_categories Software nav_tags windows nav_tags windows 10 nav_tags windows 11 nav_tags disk nav_tags partition nav_tags proxmox

I have a Windows 10 template that I use in Proxmox when I have the need to actually use Windows 10.

It has a 50Gb hard drive configured, which most of the time, is more than enough drive space.

However, I did run into an instance where I needed to expand the hard drive from 50Gb --> 100Gb for a test I was running.

There are two ways of expanding the hard drive in Proxmox:

  1. Using the command line
  2. Using the web interface

Both are pretty simple.

Expand the hard drive using the command line

Expanding the hard drive from the command line is actually just a single command, but verifying the before and after hard drive size adds two additional commands.

Check the current hard drive size

Note the 50Gb size of scsi0

tom@proxmox1:~$ sudo qm config 132
bios: ovmf
boot: order=scsi0;net0
cores: 2
cpu: x86-64-v2-AES
efidisk0: Storage:132/vm-132-disk-0.qcow2,efitype=4m,pre-enrolled-keys=1,size=528K
machine: pc-q35-9.0
memory: 16384
meta: creation-qemu=9.0.2,ctime=1733358878
name: Win10-HD-expand-HD
net0: e1000=BC:24:11:4B:28:34,bridge=vmbr0
numa: 0
ostype: win11
scsi0: Storage:132/vm-132-disk-1.qcow2,iothread=1,size=50G
scsihw: virtio-scsi-single
smbios1: uuid=1b22570f-47ca-4f6e-968d-449a469158fd
sockets: 1
tpmstate0: Storage:132/vm-132-disk-2.raw,size=4M,version=v2.0
vmgenid: 5eee602e-a2eb-42dd-85d4-9322d88b551a

Expand the hard drive

tom@proxmox1:~$ sudo qm resize 132 scsi0 +50G
Image resized.

Verify the new hard drive space

Now scsi0 shows up as 100Gb

tom@proxmox1:~$ sudo qm config 132
bios: ovmf
boot: order=scsi0;net0
cores: 2
cpu: x86-64-v2-AES
efidisk0: Storage:132/vm-132-disk-0.qcow2,efitype=4m,pre-enrolled-keys=1,size=528K
machine: pc-q35-9.0
memory: 16384
meta: creation-qemu=9.0.2,ctime=1733358878
name: Win10-HD-expand-HD
net0: e1000=BC:24:11:4B:28:34,bridge=vmbr0
numa: 0
ostype: win11
scsi0: Storage:132/vm-132-disk-1.qcow2,iothread=1,size=100G
scsihw: virtio-scsi-single
smbios1: uuid=1b22570f-47ca-4f6e-968d-449a469158fd
sockets: 1
tpmstate0: Storage:132/vm-132-disk-2.raw,size=4M,version=v2.0
vmgenid: 5eee602e-a2eb-42dd-85d4-9322d88b551a

Expand the hard drive using the web interface

Expanding the hard drive using the web interface is just as easy as using the command line.

  1. Select the Windows virtual machine
  2. Click ont the Hardware tab of the virtual machine
  3. Select the hard drive to be expanded.
  4. In the Disk Action select +Resize

Resize menu selection

  1. Enter the amount of space you want to add to the hard drive space

Add hard drive space

Now the Windows VM shows a 100Gb hard drive:

100Gb hard drive