docs: function getVirtualDiskCatalog(nodeId){
          return waterline.catalogs.findMostRecent({
              node: nodeId,
              source: 'megaraid-virtual-disks'
          })
          .then(function (virtualDiskCatalog) {
              if (!_.has(virtualDiskCatalog, 'data.Controllers[0]')) {
                  return Promise.reject(
                      new Error('Could not find megaraid-virtual-disks catalog data.'));
              }
              return virtualDiskCatalog.data;
          });
      }