GitHub user yyzkevin edited a comment on the discussion: NAS B&R KVM (ACS 4.20) 
Restore & Attach Issue

I do not receive any error, everything looks as expected the backup is used to 
create a volume on the primary storage and it is attached to the instance 
(running or stopped).     I initially noticed that the attached disk had no 
partition table,     and when I looked at start of the device (vdb) I could see 
it was actually a qcow2 label  seen from within the guest.

This is what is seen on the hypervisor, which is Ubuntu 24.04.2 LTS.       

<pre>
root@cs-node1:/# virsh qemu-monitor-command i-2-89-VM --hmp 'info block'
libvirt-2-format: 
/mnt/12490f2a-e712-308b-9479-0bcc3d465d8b/67f72268-35b4-4964-98d3-a5298bd958c8 
(qcow2)
    Attached to:      /machine/peripheral/virtio-disk0/virtio-backend
    Cache mode:       writeback

ide0-1-0: [not inserted]
    Attached to:      ide0-1-0
    Removable device: not locked, tray closed

libvirt-5-format: 
/mnt/12490f2a-e712-308b-9479-0bcc3d465d8b/63423044-52bd-40ef-9d7c-ec1939ceaf04 
(raw)
    Attached to:      /machine/peripheral/virtio-disk1/virtio-backend
    Cache mode:       writeback, direct
</pre>

When I look in the volumes table I see its format is NULL.

<pre>
+----+---------------------------+--------+
| id | name                      | format |
+----+---------------------------+--------+
| 93 | ROOT-89                   | QCOW2  |
| 94 | RestoredVol-THE GOOD DISK | NULL   |
| 95 | RestoredVol-THE GOOD DISK | NULL   |
| 96 | RestoredVol-ROOT-86       | NULL   |
+----+---------------------------+--------+
</pre>




GitHub link: 
https://github.com/apache/cloudstack/discussions/10829#discussioncomment-13074041

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