4.1 First-time installation 4.1.1 Installing the hardware The initial installation of the IBM FlashSystem 900 includes unpacking the system and  installing it in a rack. When the system is physically installed in rack, it must be connected to  power and cabled for management. Also, it must be cabled for communication with hosts. This chapter describes unpacking the system to getting it ready for use. Hint:  Consider saving the original packaging, if the system might be moved later. The replaceable components of the IBM FlashSystem 900 are installed from the front or the  back of the enclosure.  The installation poster (see Figure 4-1) that is included with the system when it is delivered  from the factory is an overview of how to prepare the system for first-time use. To install an enclosure in a rack, complete the following steps: 94  Implementing IBM FlashSystem 900 Model AE3 Rack installation Figure 4-1 Installation poster 1. Install the rack mount rails. Installation poster