Comment 6 for bug 1782714

I think this could be related to how things are seen now with the multi-attach feature.

Prior to having multi-attach we stored the "attached_mode" in the volume's metadata (which is presented as the "Properties" column by the OpenStack client.

But now that we have multi-attach we store the "attached_mode" as a specific column in our "volume_attachment" DB table.

So I think that after we do a migration of a volume we may lose that metadata.

Please set use the following command to see the attachments available on the volume:
  "cinder --os-volume-api-version=3.27 attachment-list --volume-id=4394bec9-3b87-4a6e-b977-cb56719b0d2a"

And once you have the ID of the attachment, check the details with
  "cinder --os-volume-api-version=3.27 attachment-show $ATTACHMENT_UUID"

And see if the right attachment mode is present there.