Fujitsu ETERNUS DX S5 Series Design Manual page 306

7. Maintenance/Expansion
Hot Swap/Hot Expansion
*3: Bootup and Utility Device.
*4: An I/O suspension may be required depending on the firmware changes.
*5: Mid Plane. This is a board that is located between the front and rear (controller (CM) or I/O module (IOM) side) of the ETERNUS DX.
*6: Operation can be continued during a failure. The status of the ETERNUS DX can be monitored via ETERNUS Web GUI or ETERNUS CLI.
*7: FEMs are installed in high-density drive enclosures.
306 Design Guide