3.3 Planning for power This section describes necessary information for planning to attach both power supplies to  the main power supply lines.  Plan to connect the power cords on the right side of the rack (when viewed from the rear)  to power sources that provide power in the 100 - 127 V / 200 - 240 V AC range at 10.0/50A  50/60 Hz.  Each power supply can provide a maximum output power of 1300 W if a high line voltage  (200-240V AC at 6.9A, 50/60 Hz) power source is used (this configuration is the  recommended power configuration). Power supplies also can provide a maximum output  power of 900 W if a low line voltage (100-165V AC at 10.0A, 50/60 Hz) power source is used. Note:  High line power is strongly advised for systems using the large or extra large  modules. When using low line voltage, a system populated with large or extra large flash  modules will throttle I/O if running on a single power supply, such as the case if a a PSU  fails. Using two power sources provides power redundancy. Note:  We suggest that you place the two power supplies on different circuits. Both power connections are shown in Figure 3-1. Figure 3-1 FlashSystem 900 rear view and power connections The power cables are specific to the power requirements of your country or region. Important:  The power cord is the main power disconnect. Ensure that the socket outlets  are near the equipment and easily accessible.  3.4 Configuration planning You must plan for the management address and service addresses before the system is  installed. A management address must be assigned to the system. The  management address  provides access to system configuration and administration functions, such as the  management GUI and CLI. Chapter 3. Planning  81