After properly powering and cabling a storage system, some of the drive enclosures are still not available. Which of the following should be checked FIRST?

Faulty drives would typically affect individual drives or RAID groups within an enclosure, not the recognition of the entire enclosure itself.

Enclosure controllers are part of the enclosure's hardware; while a faulty controller could prevent an enclosure from being seen, checking the logical addressing is a more common and specific first step when physical connectivity is confirmed.

Enclosure addressing, such as SAS enclosure IDs or Fibre Channel port assignments, is crucial for the storage system controllers to properly discover and communicate with attached drive enclosures. If the addressing is incorrect, duplicated, or not set, the controllers will not be able to enumerate the enclosures, making them appear unavailable even if physically connected and powered on.

Bad cables were implicitly excluded by the question stating the system was 'properly powering and cabling,' making logical configuration issues like addressing more likely.