Proxmox

Increase disk size in the GUI or with the following command

Resize Disk

Increase disk size

Increase disk size in the GUI or with the following command

1

qm resize 100 virtio0 +5G

Decrease disk size

Before decreasing disk sizes in Proxmox, you should take a backup!

1. Convert qcow2 to raw

1

qemu-img convert vm-100.qcow2 vm-100.raw

2. Shrink the disk

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qemu-img resize -f raw vm-100.raw 10G

3. Convert back to qcow2#

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qemu-img convert -p -O qcow2 vm-100.raw vm-100.qcow2