5U84 storage shelf rear panel

The rear panel of a 5U84 storage shelf contains the following components:

Two I/O module slots, which contain either redundant RAID controllers or Expansion modules. (Item 1)
Five cooling modules (Item 2)
Two power supply units (PSUs) (Item 3)

Each cooling module contains two fans. Cooling modules can be individually replaced but cannot be taken apart to replace only one fan.

Refer to the following sections for information about the I/O modules.