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Live-Migration fails with cinder SMB backend - error code 5 Access Denied

Hi all,

We are trying to test out a live-migration scenario with the following setup: 2 HyperV servers, both joined to the same domain, and one SMB file share failover cluster server with Cinder backend installed. We are using Liberty everywhere. We are simply trying to live migrate one instance via Horizon but the migration fails and we receive the following error (in the cinder-volume.log of the Cinder backend):

We have added full control permissions to every single computer or group possible, but we are still facing this error.

We would be really grateful if anyone could give us some least telling us why would cinder like to open the vhdx file when we reqeested a live-migration?