GitHub user Sparc0 added a comment to the discussion: Migrate from oVirt/RHEV 
to Cloudstack

When we did the POC for CS we did a test migration similar to what you wrote. 
It works for a few VM's but not hundreds. 

Turn off the VM you want to migrate.
get the VM's volume id by checking under Storage -> Disks.
Copy the ID
On any ovirt hypervisor do: rbd export ovirt.rbd/volume-<id> <path>/<name>.raw
SCP this raw file to any cloudstack hypervisor and do: rbd import 
server1-root.raw cs_primary/server1
Go to Cloudstack UI under Tools -> Import Data Volume 
Choose the correct storage pool and your imported RBD should show up as 
unmanaged.
Click to make it managed. 
Create a new instance
Attach the volume you imported to the instance using Device ID: 0 (Imported 
else the disk will not be root disk)
Start the Instance.

GitHub link: 
https://github.com/apache/cloudstack/discussions/13073#discussioncomment-16732032

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