[ovirt-users] Should we remove direct luns from VM before creating snapshots?

We know that now oVirt doesn't make snapshot for direct lun. Please consider this scenario: I have a VM with total 2 disks: the os image disk is created on the nfs domain, while the other one is a direct lun disk. Now I'd like to create a snapshot, 1. should I remove the direct lun disk first, then make a snapshot? 2. If I don't remove the direct lun disk, oVirt will exclude it automatically, and snapshot can also be created successfully. But I have no idea if this is supported by oVirt, please anyone can make some comments? Thanks much.