CLONING issue on Proxmox VE 9.2.4, QEMU 11.0.3

D

dick_fiddler69

New Member
May 1, 2026
18
3
3
Fustrated by this!

CLONE-ing was working fine in May 2026, on a Template, which we use to deploy 200-600 VMs at a time.

agent: enabled=1
bios: ovmf
boot: order=scsi0
cores: 2
cpu: x86-64-v2-AES
efidisk0: nfs_datastore7:9990/base-9990-disk-0.qcow2,size=128K
ipconfig0: ip=dhcp
memory: 2048
name: Template A
net0: virtio=BC:24:11:F3:BF:FC,bridge=vmbr2975
ostype: l26
scsi0: nfs_datastore7:9990/base-9990-disk-1.qcow2,size=40G
scsi1: nfs_datastore7:9990/vm-9990-cloudinit.qcow2,media=cdrom,size=4M
scsihw: virtio-scsi-pci
smbios1: uuid=25ef0528-0d77-472d-93f8-5e4cecfe2c4b
tags:
template: 1
vga: std
vmgenid: affa8009-6759-427f-9a43-174e8787e573

I've been struggling to CLONE a new template based on Ubuntu 26.x LTS

agent: enabled=1
bios: ovmf
boot: order=ide2;scsi0
cores: 2
cpu: x86-64-v4
efidisk0: nfs_datastore7:9996/vm-9996-disk-1.qcow2,size=128K
ide2: local:iso/ubuntu-26.04.1-live-server-amd64.iso,media=cdrom,size=2859240K
ipconfig0: ip=dhcp
machine: q35
memory: 4096
meta: creation-qemu=11.0.3,ctime=1788447319
name: Template B
net0: virtio=BC:24:11:CD:FB:6A,bridge=vmbr2975
ostype: l26
scsi0: nfs_datastore7:9996/vm-9996-disk-0.qcow2,size=40G
scsi1: nfs_datastore7:9996/vm-9996-cloudinit.qcow2,media=cdrom,size=4M
scsihw: virtio-scsi-pci
smbios1: uuid=bbcc2a4a-dd29-4dbb-955d-cb18cccaf073
tags: linux;production;sdi-students;template
template: 0
vga: std
vmgenid: ff651991-72aa-407a-acf4-9bb7ae22684d

I just cannot CLONE the template above, it fails to boot with UEFI issues.

I'm not sure why the first template when CLONE is cloned correctly and takes 5-6 minutes to clone, but the second Template B - above the CLONE is instant, and as it only copues 7MB ! IT's not surprised it fails.

I thought it may because the templates are on different datastores, so migrated Template B, from the datastore it was re-siding on, to this new datastore, and guess what the resulting template/VM is trashed.

So what's going on here with the Migarte/Clone function.
 
Hi,

I may be missing something, but from the config you posted, Template B seems to have:

template: 0

while Template A has:

template: 1

So I would first check whether Template B was actually converted to a Proxmox template.

Also, Template B still appears to have the installer ISO attached and the boot order starts with ide2.
 
kawano-y said:
Hi,

I may be missing something, but from the config you posted, Template B seems to have:

template: 0

while Template A has:

template: 1

So I would first check whether Template B was actually converted to a Proxmox template.

Also, Template B still appears to have the installer ISO attached and the boot order starts with ide2.
Click to expand...
just as and when the configs were captured. as it's been a work in progress for last two days of fustration, and now Migration of a VM, has broken the VM completely, by just copying 7MB !

Just rebuilding a quick new Ubuntu 26.06 LTS....
 
Last edited:
Okay, so a little more testing.

Create a new VM - 9997 - Ubuntu 26.04 LTS (same node), different datastore - NetApp backed.

qm create 9997 \
--name CS-Module-661982-SDI-2026-2027-Ubuntu26 \
--memory 4096 \
--cores 2 \
--cpu x86-64-v4 \
--bios ovmf \
--machine q35 \
--ostype l26 \
--scsihw virtio-scsi-pci \
--scsi0 nfs_datastore7:40,format=qcow2 \
--efidisk0 nfs_datastore7:1,format=qcow2,efitype=4m,pre-enrolled-keys=1 \
--scsi1 nfs_datastore7:cloudinit \
--net0 virtio,bridge=vmbr2975 \
--ipconfig0 ip=dhcp \
--agent enabled=1 \
--vga std \
--tags linux,production,sdi-students,template

# Attach ISO:
qm set 9997 --ide2 local:iso/ubuntu-26.04.1-live-server-amd64.iso,media=cdrom
qm set 9997 --boot "order=ide2;scsi0"

qm start 9997
Formatting '/mnt/pve/nfs_datastore7/images/9997/vm-9997-disk-0.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=540672 lazy_refcounts=off refcount_bits=16
transferred 0.0 B of 528.0 KiB (0.00%)
transferred 528.0 KiB of 528.0 KiB (100.00%)
transferred 528.0 KiB of 528.0 KiB (100.00%)
INFO: reading raw edk2 varstore from /usr/share/pve-edk2-firmware//OVMF_VARS_4M.ms.fd
INFO: var store range: 0x64 -> 0x40000
efidisk0: successfully created disk 'nfs_datastore7:9997/vm-9997-disk-0.qcow2,efitype=4m,ms-cert=2023k,pre-enrolled-keys=1,size=528K'
Formatting '/mnt/pve/nfs_datastore7/images/9997/vm-9997-disk-1.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=42949672960 lazy_refcounts=off refcount_bits=16
scsi0: successfully created disk 'nfs_datastore7:9997/vm-9997-disk-1.qcow2,size=40G'
Formatting '/mnt/pve/nfs_datastore7/images/9997/vm-9997-cloudinit.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=4194304 lazy_refcounts=off refcount_bits=16
scsi1: successfully created disk 'nfs_datastore7:9997/vm-9997-cloudinit.qcow2,media=cdrom'
update VM 9997: -ide2 local:iso/ubuntu-26.04.1-live-server-amd64.iso,media=cdrom
update VM 9997: -boot order=ide2;scsi0
generating cloud-init ISO

qm clone 9997 6003 \
--name test-9997-clone \
--storage nfs_datastore7 \
--full

qm start 6003
disk size: 840 KiB
disk size: 840 KiB
creating a clone of VM 9997 with ID 6003
create full clone of drive efidisk0 (nfs_datastore7:9997/vm-9997-disk-0.qcow2)
Formatting '/mnt/pve/nfs_datastore7/images/6003/vm-6003-disk-0.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=540672 lazy_refcounts=off refcount_bits=16
allocated target volume 'nfs_datastore7:6003/vm-6003-disk-0.qcow2'
create full clone of drive scsi0 (nfs_datastore7:9997/vm-9997-disk-1.qcow2)
Formatting '/mnt/pve/nfs_datastore7/images/6003/vm-6003-disk-1.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=42949672960 lazy_refcounts=off refcount_bits=16
allocated target volume 'nfs_datastore7:6003/vm-6003-disk-1.qcow2'
transferred 0.0 B of 40.0 GiB (0.00%)
transferred 409.6 MiB of 40.0 GiB (1.00%)
transferred 823.3 MiB of 40.0 GiB (2.01%)
transferred 1.2 GiB of 40.0 GiB (3.01%)
transferred 1.6 GiB of 40.0 GiB (4.01%)
transferred 2.0 GiB of 40.0 GiB (5.01%)
transferred 2.4 GiB of 40.0 GiB (6.01%)
transferred 2.8 GiB of 40.0 GiB (7.02%)
transferred 3.2 GiB of 40.0 GiB (8.02%)
transferred 3.6 GiB of 40.0 GiB (9.02%)
transferred 4.0 GiB of 40.0 GiB (10.03%)
transferred 4.4 GiB of 40.0 GiB (11.03%)
transferred 4.8 GiB of 40.0 GiB (12.03%)
transferred 5.2 GiB of 40.0 GiB (13.04%)
transferred 5.6 GiB of 40.0 GiB (14.04%)
transferred 6.0 GiB of 40.0 GiB (15.04%)
transferred 6.4 GiB of 40.0 GiB (16.05%)
transferred 6.8 GiB of 40.0 GiB (17.05%)
transferred 7.2 GiB of 40.0 GiB (18.06%)
transferred 7.6 GiB of 40.0 GiB (19.06%)
transferred 8.0 GiB of 40.0 GiB (20.06%)
transferred 8.4 GiB of 40.0 GiB (21.07%)
transferred 8.8 GiB of 40.0 GiB (22.07%)
transferred 9.2 GiB of 40.0 GiB (23.07%)
transferred 9.6 GiB of 40.0 GiB (24.08%)
transferred 10.0 GiB of 40.0 GiB (25.08%)
transferred 10.4 GiB of 40.0 GiB (26.09%)
transferred 10.8 GiB of 40.0 GiB (27.09%)
transferred 11.2 GiB of 40.0 GiB (28.09%)
transferred 11.6 GiB of 40.0 GiB (29.09%)
transferred 12.0 GiB of 40.0 GiB (30.10%)
transferred 12.4 GiB of 40.0 GiB (31.10%)
transferred 12.8 GiB of 40.0 GiB (32.11%)
transferred 13.2 GiB of 40.0 GiB (33.11%)
transferred 13.6 GiB of 40.0 GiB (34.11%)
transferred 14.0 GiB of 40.0 GiB (35.11%)
transferred 14.4 GiB of 40.0 GiB (36.12%)
transferred 14.8 GiB of 40.0 GiB (37.12%)
transferred 15.3 GiB of 40.0 GiB (38.13%)
transferred 15.7 GiB of 40.0 GiB (39.13%)
transferred 16.1 GiB of 40.0 GiB (40.13%)
transferred 16.5 GiB of 40.0 GiB (41.14%)
transferred 16.9 GiB of 40.0 GiB (42.14%)
transferred 17.3 GiB of 40.0 GiB (43.15%)
transferred 17.7 GiB of 40.0 GiB (44.15%)
transferred 18.1 GiB of 40.0 GiB (45.15%)
transferred 18.5 GiB of 40.0 GiB (46.16%)
transferred 18.9 GiB of 40.0 GiB (47.16%)
transferred 19.3 GiB of 40.0 GiB (48.16%)
transferred 19.7 GiB of 40.0 GiB (49.16%)
transferred 20.1 GiB of 40.0 GiB (50.17%)
transferred 20.5 GiB of 40.0 GiB (51.17%)
transferred 20.9 GiB of 40.0 GiB (52.18%)
transferred 21.3 GiB of 40.0 GiB (53.18%)
transferred 21.7 GiB of 40.0 GiB (54.18%)
transferred 22.1 GiB of 40.0 GiB (55.19%)
transferred 22.5 GiB of 40.0 GiB (56.19%)
transferred 22.9 GiB of 40.0 GiB (57.20%)
transferred 23.3 GiB of 40.0 GiB (58.20%)
transferred 23.7 GiB of 40.0 GiB (59.21%)
transferred 24.1 GiB of 40.0 GiB (60.21%)
transferred 24.5 GiB of 40.0 GiB (61.21%)
transferred 24.9 GiB of 40.0 GiB (62.22%)
transferred 25.3 GiB of 40.0 GiB (63.22%)
transferred 25.7 GiB of 40.0 GiB (64.23%)
transferred 26.1 GiB of 40.0 GiB (65.23%)
transferred 26.5 GiB of 40.0 GiB (66.24%)
transferred 26.9 GiB of 40.0 GiB (67.24%)
transferred 27.3 GiB of 40.0 GiB (68.25%)
transferred 27.7 GiB of 40.0 GiB (69.25%)
transferred 28.1 GiB of 40.0 GiB (70.26%)
transferred 28.5 GiB of 40.0 GiB (71.26%)
transferred 28.9 GiB of 40.0 GiB (72.26%)
transferred 29.3 GiB of 40.0 GiB (73.27%)
transferred 29.7 GiB of 40.0 GiB (74.27%)
transferred 30.1 GiB of 40.0 GiB (75.28%)
transferred 30.5 GiB of 40.0 GiB (76.28%)
transferred 30.9 GiB of 40.0 GiB (77.29%)
transferred 31.3 GiB of 40.0 GiB (78.29%)
transferred 31.7 GiB of 40.0 GiB (79.30%)
transferred 32.1 GiB of 40.0 GiB (80.30%)
transferred 32.5 GiB of 40.0 GiB (81.31%)
transferred 32.9 GiB of 40.0 GiB (82.31%)
transferred 33.3 GiB of 40.0 GiB (83.31%)
transferred 33.7 GiB of 40.0 GiB (84.32%)
transferred 34.1 GiB of 40.0 GiB (85.32%)
transferred 34.5 GiB of 40.0 GiB (86.33%)
transferred 34.9 GiB of 40.0 GiB (87.33%)
transferred 35.3 GiB of 40.0 GiB (88.34%)
transferred 35.7 GiB of 40.0 GiB (89.34%)
transferred 36.1 GiB of 40.0 GiB (90.35%)
transferred 36.5 GiB of 40.0 GiB (91.35%)
transferred 36.9 GiB of 40.0 GiB (92.36%)
transferred 37.3 GiB of 40.0 GiB (93.36%)
transferred 37.7 GiB of 40.0 GiB (94.36%)
transferred 38.1 GiB of 40.0 GiB (95.37%)
transferred 38.5 GiB of 40.0 GiB (96.37%)
transferred 39.0 GiB of 40.0 GiB (97.38%)
transferred 39.4 GiB of 40.0 GiB (98.38%)
transferred 39.8 GiB of 40.0 GiB (99.39%)
transferred 40.0 GiB of 40.0 GiB (100.00%)
transferred 40.0 GiB of 40.0 GiB (100.00%)
create full clone of drive scsi1 (nfs_datastore7:9997/vm-9997-cloudinit.qcow2)
Formatting '/mnt/pve/nfs_datastore7/images/6003/vm-6003-cloudinit.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=4194304 lazy_refcounts=off refcount_bits=16
allocated target volume 'nfs_datastore7:6003/vm-6003-cloudinit.qcow2'
generating cloud-init ISO

CLONE WORKS!
Create another VM on Dell PowerStore
qm create 9998 \
--name test-powerstore-ubuntu26 \
--memory 4096 \
--cores 2 \
--cpu x86-64-v4 \
--bios ovmf \
--machine q35 \
--ostype l26 \
--scsihw virtio-scsi-pci \
--scsi0 nfs_powerstore2:40,format=qcow2 \
--efidisk0 nfs_powerstore2:1,format=qcow2,efitype=4m,pre-enrolled-keys=1 \
--scsi1 nfs_powerstore2:cloudinit \
--net0 virtio,bridge=vmbr2975 \
--agent enabled=1 \
--vga std


qm set 9998 --ide2 local:iso/ubuntu-26.04.1-live-server-amd64.iso,media=cdrom
qm set 9998 --boot "order=ide2;scsi0"
qm start 9998
Formatting '/mnt/pve/nfs_powerstore2/images/9998/vm-9998-disk-0.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=540672 lazy_refcounts=off refcount_bits=16
transferred 0.0 B of 528.0 KiB (0.00%)
transferred 528.0 KiB of 528.0 KiB (100.00%)
transferred 528.0 KiB of 528.0 KiB (100.00%)
INFO: reading raw edk2 varstore from /usr/share/pve-edk2-firmware//OVMF_VARS_4M.ms.fd
INFO: var store range: 0x64 -> 0x40000
efidisk0: successfully created disk 'nfs_powerstore2:9998/vm-9998-disk-0.qcow2,efitype=4m,ms-cert=2023k,pre-enrolled-keys=1,size=528K'
Formatting '/mnt/pve/nfs_powerstore2/images/9998/vm-9998-disk-1.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=42949672960 lazy_refcounts=off refcount_bits=16
scsi0: successfully created disk 'nfs_powerstore2:9998/vm-9998-disk-1.qcow2,size=40G'
Formatting '/mnt/pve/nfs_powerstore2/images/9998/vm-9998-cloudinit.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=4194304 lazy_refcounts=off refcount_bits=16
scsi1: successfully created disk 'nfs_powerstore2:9998/vm-9998-cloudinit.qcow2,media=cdrom'
update VM 9998: -ide2 local:iso/ubuntu-26.04.1-live-server-amd64.iso,media=cdrom
update VM 9998: -boot order=ide2;scsi0
generating cloud-init ISO

qm clone 9998 6004 \
--name test-9998-clone \
--storage nfs_powerstore2 \
--full
qm start 6004
VM 9998 not running

creating a clone of VM 9998 with ID 6004
create full clone of drive efidisk0 (nfs_powerstore2:9998/vm-9998-disk-0.qcow2)
Formatting '/mnt/pve/nfs_powerstore2/images/6004/vm-6004-disk-0.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=540672 lazy_refcounts=off refcount_bits=16
allocated target volume 'nfs_powerstore2:6004/vm-6004-disk-0.qcow2'
create full clone of drive scsi0 (nfs_powerstore2:9998/vm-9998-disk-1.qcow2)
Formatting '/mnt/pve/nfs_powerstore2/images/6004/vm-6004-disk-1.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=42949672960 lazy_refcounts=off refcount_bits=16
allocated target volume 'nfs_powerstore2:6004/vm-6004-disk-1.qcow2'
transferred 0.0 B of 40.0 GiB (0.00%)
transferred 40.0 GiB of 40.0 GiB (100.00%)
transferred 40.0 GiB of 40.0 GiB (100.00%)
create full clone of drive scsi1 (nfs_powerstore2:9998/vm-9998-cloudinit.qcow2)
Formatting '/mnt/pve/nfs_powerstore2/images/6004/vm-6004-cloudinit.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=4194304 lazy_refcounts=off refcount_bits=16
allocated target volume 'nfs_powerstore2:6004/vm-6004-cloudinit.qcow2'
generating cloud-init ISO

Something is very odd, as this is instant!

qemu-img info /mnt/pve/nfs_powerstore2/images/6004/vm-6004-disk-1.qcow2 | grep "disk size"
disk size: 7.68 MiB
disk size: 7.68 MiB

CLONE IS BROKEN!

Just trying another Dell Powerstore datastore.
 
qemu-img info /mnt/pve/nfs_powerstore/images/9999/vm-9999-disk-1.qcow2 | grep "disk size"
disk size: 5.39 GiB
disk size: 5.39 GiB
root@PVE-HYP-06P10:~# ^C
root@PVE-HYP-06P10:~# qm shutdown 9999

qm clone 9999 6005 \
--name test-powerstore1-clone \
--storage nfs_powerstore \
--full

qemu-img info /mnt/pve/nfs_powerstore/images/6005/vm-6005-disk-1.qcow2 | grep "disk size"

qm start 6005
QEMU Guest Agent is not running - VM 9999 qga command 'guest-ping' failed - got timeout
creating a clone of VM 9999 with ID 6005
create full clone of drive efidisk0 (nfs_powerstore:9999/vm-9999-disk-0.qcow2)
Formatting '/mnt/pve/nfs_powerstore/images/6005/vm-6005-disk-0.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=540672 lazy_refcounts=off refcount_bits=16
allocated target volume 'nfs_powerstore:6005/vm-6005-disk-0.qcow2'
create full clone of drive scsi0 (nfs_powerstore:9999/vm-9999-disk-1.qcow2)
Formatting '/mnt/pve/nfs_powerstore/images/6005/vm-6005-disk-1.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=42949672960 lazy_refcounts=off refcount_bits=16
allocated target volume 'nfs_powerstore:6005/vm-6005-disk-1.qcow2'
transferred 0.0 B of 40.0 GiB (0.00%)
transferred 40.0 GiB of 40.0 GiB (100.00%)
transferred 40.0 GiB of 40.0 GiB (100.00%)
create full clone of drive scsi1 (nfs_powerstore:9999/vm-9999-cloudinit.qcow2)
Formatting '/mnt/pve/nfs_powerstore/images/6005/vm-6005-cloudinit.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=4194304 lazy_refcounts=off refcount_bits=16
allocated target volume 'nfs_powerstore:6005/vm-6005-cloudinit.qcow2'
disk size: 7.35 MiB
disk size: 7.35 MiB
generating cloud-init ISO
root@PVE-HYP-06P10:~#
 
So I think it's conclusive, if we try and clone, from VMs on the Dell Powerstore, cloning is broke.

5.39 GiB → 7.35 MiB on clone
 
qemu-img convert -p -f qcow2 -O qcow2 \
/mnt/pve/nfs_powerstore/images/9999/vm-9999-disk-1.qcow2 \
/mnt/pve/nfs_powerstore/images/9999/vm-9999-converted.qcow2

qemu-img info /mnt/pve/nfs_powerstore/images/9999/vm-9999-converted.qcow2 | grep "disk size"
(100.00/100%)
disk size: 336 KiB
disk size: 336 KiB

doesn't work
 
Make sure the dell is up to date. This sounds like a problem on their side.

If it is, try mounting as a lower nfs version. Afaik the sparse improvements are only for 4.2 , so 4.1 might work better.
 
tschmidt said:
Make sure the dell is up to date. This sounds like a problem on their side.

If it is, try mounting as a lower nfs version. Afaik the sparse improvements are only for 4.2 , so 4.1 might work better.
Click to expand...
tried, changing all the NFS variables, 3,4,4.1, 4.2, nconnect - Dell PowerStore is very new, and all up to date.
 
its sort of solved using dd, on the original vm, so it's sparse source which causes the issue.

sparse source on Dell Powerstore.

I wonder if the sparse bug on lvm-thin, is the same issue.
 
Last edited:
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