When the shelfs of a single system are being inspected, the current getter for the shelf-bay object is missing one of the two port lists. This is not an error, if the NetApp system is a single-system (not an HA). For instance, a FAS2520 system with an integrated shelf does not have a second filer, therefore the B module is not visible.
In order to successfully collect data needed for any further analysis in such systems, we are introducing the switch
--single_system. If this switch is set, empty port lists of a shelf are not treated as errors.
This switch will be available in version 3.3.1.
Links: ShelfBay Check