When we target storage domain we do not fetch storage domains where vm's disks are located.
Piotr, please add PR link.
Verified on CFME-5.7.0.3.20160927165516_075d0f3, and RHV-4.0.4.4-0.1.el7ev For a down VM, that has 1 disk attached, that reside on one NFS storage, open CFME VM summary page. From RHV side, add a 2nd disk to the VM, that reside on another NFS storage domain. Refresh the VM summary page, gets Devices updated with the additional disk.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2017-0012.html