[cinder] not rescanning during VM attach

Hi all, We have a customer problem where LUNs are not able to be scanned in time by cinder, so the operation fails. We fixed the problem in the "create image from volume workflow" by configuring "num_volume_device_scan_tries" in cinder.conf to a larger value. However, this doesn't appear to work for creating a VM and attaching to it, which still always fails. Any configuration or advice here? Thank you, Anthony