anchor.diff:      OpNode3 = nodes:service_to_node(?SERVICE_PANEL, OpHost3),
   
       % code based on service_ceph_osd:prepare_loopdevice/1
  -    Size = 1 * 1024 * 1024 * 1024,
  +    Size = ?LOOPDEVICE_SIZE,
       UUID = ?OSD_UUID3,
       Path = ?MOCK_BLOCKDEVICE_PATH,
       Loop = ?assertMatch(<<_/binary>>,
  
positive.code:             #{
                  type => loopdevice,
                  host => OpHost1,
                  size => 1 * 1024 * 1024 * 1024,
                  uuid => ?OSD_UUID1 % UUID is always sent by user or filled in rest_ceph
              }
          ]
  
negative.code:                 host => OpHost3,
                  type => loopdevice,
                  path => ?CUSTOM_LOOP_PATH,
                  size => ?LOOPDEVICE_SIZE,
                  uuid => ?OSD_UUID2
              }
          ]
  