qemu-img: output file is smaller than input file ?

[niuk]

I am trying to convert PA-VM-KVM-8.0.0.qcow2 image to disk in the VM I just created (see VM config 101.conf). It says output file is smaller than input file , why ?

root@pve:/var/lib/vz/images# cat /etc/pve/nodes/pve/qemu-server/101.conf
bootdisk: virtio0
cores: 1
ide2: none,media=cdrom
memory: 2048
name: pan-os-8.0
net0: virtio=DE:5F:17:161:3C,bridge=vmbr0
numa: 0
ostype: l26
scsihw: virtio-scsi-pci
smbios1: uuid=4c337c77-5489-40d5-8f21-3cb56f43e70a
sockets: 1
virtio0: local-lvm:vm-101-disk-1,size=16G
root@pve:/var/lib/vz/images# find / -name vm-101-disk-1
/dev/pve/vm-101-disk-1
root@pve:/var/lib/vz/images# ls -lh
total 1.9G
-rw-r--r-- 1 root root 1.9G Mar 17 09:22 PA-VM-KVM-8.0.0.qcow2
root@pve:/var/lib/vz/images# qemu-img convert -O raw -p -n PA-VM-KVM-8.0.0.qcow2 local-lvm:vm-101-disk-1
qemu-img: Unknown protocol 'local-lvm'

root@pve:/var/lib/vz/images# qemu-img convert -O raw -p -n PA-VM-KVM-8.0.0.qcow2 local-lvm:vm-101-disk-1
qemu-img: Unknown protocol 'local-lvm'

root@pve:/var/lib/vz/images# qemu-img convert -O raw -p -n PA-VM-KVM-8.0.0.qcow2 /dev/pve/vm-101-disk-1
qemu-img: output file is smaller than input file

 

[udo]

I am trying to convert PA-VM-KVM-8.0.0.qcow2 image to disk in the VM I just created (see VM config 101.conf). It says output file is smaller than input file , why ?

root@pve:/var/lib/vz/images# cat /etc/pve/nodes/pve/qemu-server/101.conf
bootdisk: virtio0
cores: 1
ide2: none,media=cdrom
memory: 2048
name: pan-os-8.0
net0: virtio=DE:5F:17:161:3C,bridge=vmbr0
numa: 0
ostype: l26
scsihw: virtio-scsi-pci
smbios1: uuid=4c337c77-5489-40d5-8f21-3cb56f43e70a
sockets: 1
virtio0: local-lvm:vm-101-disk-1,size=16G
root@pve:/var/lib/vz/images# find / -name vm-101-disk-1
/dev/pve/vm-101-disk-1
root@pve:/var/lib/vz/images# ls -lh
total 1.9G
-rw-r--r-- 1 root root 1.9G Mar 17 09:22 PA-VM-KVM-8.0.0.qcow2
root@pve:/var/lib/vz/images# qemu-img convert -O raw -p -n PA-VM-KVM-8.0.0.qcow2 local-lvm:vm-101-disk-1
qemu-img: Unknown protocol 'local-lvm'

root@pve:/var/lib/vz/images# qemu-img convert -O raw -p -n PA-VM-KVM-8.0.0.qcow2 local-lvm:vm-101-disk-1
qemu-img: Unknown protocol 'local-lvm'

root@pve:/var/lib/vz/images# qemu-img convert -O raw -p -n PA-VM-KVM-8.0.0.qcow2 /dev/pve/vm-101-disk-1
qemu-img: output file is smaller than input file

Hi,
does the qcow2-file fit in the logical volume?

qemu-img info /var/lib/vz/images/PA-VM-KVM-8.0.0.qcow2
lvdisplay /dev/pve/vm-101-disk-1

In this case the qcow2-file allready on the local storage (if defined as image-storage) - you can simply add them to config, like this:

mkdir /var/lib/vz/images/101
mv /var/lib/vz/images/PA-VM-KVM-8.0.0.qcow2 /var/lib/vz/images/101/vm-101-disk-1.qcow2
echo "virtio0: local:101/vm-101-disk-1.qcow2,size=16G" >> /etc/pve/nodes/pve/qemu-server/101.conf
# remove the line "virtio0: local-lvm:vm-101-disk-1,size=16G" in the config.

After the VM work, you can migrate the storage with the gui.

Udo

 

[niuk]

Appreciate , this is great instruction

 

[lucaferr]

I had the same error ("output file is smaller than input file") while importing a vhd disk from external to a VM using Ceph storage target (with command "qm importdisk"). I solved by firstly converting from vhd to raw using "qemu-img convert" and then running "qm importdisk" worked!

 

[_Lars_]

I have the same issue trying to import an VHDX-File to a Volume Group:

$ qm importdisk 100 drive0.vhdx pool_sas
importing disk 'drive0.vhdx' to VM 100 ... Logical volume "vm-100-disk-1" created. transferred: 0 bytes remaining: 108447924224 bytes total: 108447924224 bytes progression: 0.00 % qemu-img: output file is smaller than input file Logical volume "vm-100-disk-1" successfully removed copy failed: command '/usr/bin/qemu-img convert -p -n -f raw -O raw drive0.vhdx /dev/pool_sas/vm-100-disk-1' failed: exit code 1

What can I do, that 'qemu-img' is recognizing the correct input file size?