1. Installing Internal Optional DevicesExpress5800/R120d-2M User’s Guide80Chapter 2 Preparations1.16 Redundant Fan UnitThis server can work with redundant cooling fan system by adding an optional fan unit.The fan units are hot-swappable even while the system is powered-on and running.Adding an additional CPU requires additional fan unit to be installed.The figure below shows the slot numbers assigned to the slots of standard cooling fans and optional coolingfans.*1 Slots to install additional fan unit when additional CPU board is installed*2 Slots to install redundant fan unitInstall fan units in slots FAN 1F to 4F In 1-CPU configuration.Install fan units in slots FAN 1F to 5F In 2-CPU configuration.Important If you install additional fan unit, prepare to install it according to procedures inChapter 2 (1.12 Processor).冗長用ファンスロット(オプション)*2増設用FANスロット(オプション)*1前面側 背面側標準実装REARFRONTSlots for redundant fan unit(option) *1Factory-installed fanunitsSlots for additional fan unitfor additional CPU *1