The SPARC M10 systems are designed to function in an environment with naturalconvection airflow.The following requirements must be followed to meet the environmental specifications.■ Ensuring sufficient airflow for the entire systemEach chassis is equipped with a cooling function for front-to-rear cooling. Eachchassis has air vents on the front. Exhaust is expelled from the rear of each chassis.The SPARC M10 systems use internal fans whose airflow reaches the maximumexhaust airflow shown in Table 2-9 under normal operating conditions.Example: 17.1 m3 (603.8 ft.3) per minute for each SPARC M10-4/SPARC M10-4Sunit■ Ensuring that temperature at the intake part of each chassis does not exceed thelimit valueOther devices mounted in the rack must not cause the temperature at the intakepart of any chassis to exceed the limit value. This limit value in environmentalconditions assumes that each chassis operates with the rack door closed.2.8 Checking the Power Input TypeThis section describes the power input types that can be used with the SPARC M10systems. To prevent serious accidents, confirm that the power supply facilities cansupply sufficient redundant power to the system.The server can use the following power input types:■ Redundant configuration of power supply units■ Dual power feed■ Three-phase power feed■ Uninterruptible power supply (UPS) connection (optional)2.8.1 Redundant configuration of power supply unitsEach chassis has power supply units in a redundant configuration as standard. If afailure occurs in one power supply unit, the system can still continue to operate withthe other power supply unit. However, if a failure occurs in the external powersupply, the system stops.Figure 2-15, Figure 2-16, and Figure 2-17 show power supply systems withredundant power supply connections.When connecting the power cords to the same input power supply, make sure toconnect each power cord to the connection destination in a one-to-one manner.Chapter 2 Planning and Preparing for System Installation 43
