Host Board Slot Overview
The storage system is built with five host board slots per controller, as shown below.

Inserting Host/Expansion Boards
Important!
- Identical host/expansion board combinations must be used, in the same order, on both controllers.
- When installing an expansion board, use the HB 5 slot.
- Refer to the Host Board and Memory Guide on Infortrend’s website for more information, including supported host board types, supported combinations, and important notes. Go to Support > Technical Support, find your model, and then go to Downloads.
- Loosen the screw that secures the dummy bracket, and then remove the bracket from the chassis.

Note:
The HB 3 slot is used as an illustrating example. The same steps apply to the other slots.
- Insert a host board into the module slot.

- Tighten the thumb screw to secure the host board.
