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Planning the installation 10
CAUTION: When performing non-hot-plug operations, you must power down the server blade
and/or the system. Use caution when performing other operations, such as hot-plug installations
or troubleshooting.
CAUTION: Protect the equipment from AC power fluctuations and temporary interruptions with a
regulating facility UPS device. This device protects the hardware from damage caused by power
surges and voltage spikes and keeps the system in operation during a power failure.
IMPORTANT: Data on the dimensions and weights of HP BladeSystem c-Class components can
be found in the HP BladeSystem c-Class Maintenance and Service Guide. The same data can be
determined by using the online HP BladeSystem c-Class Sizing Utility.
Space and airflow requirements
To enable servicing and ensure adequate airflow, observe the following spatial requirements when deciding
where to install an HP branded, Compaq branded, telco, or third-party rack:
• Leave a minimum clearance of 63.5 cm (25 in) in front of the rack.
• Leave a minimum clearance of 76.2 cm (30 in) in back of the rack.
• Leave a minimum clearance of 121.9 cm (48 in) from the back of the rack to the rear of another rack
or row of racks.
HP BladeSystem servers draw cool air in through the front and expel warm air through the rear of the
enclosure. Therefore, the front of the rack enclosure must be adequately ventilated to enable ambient room
air to enter the enclosure, and the rear of the enclosure must be adequately ventilated to enable the warm air
to escape from the enclosure.
IMPORTANT: Do not block the ventilation openings.
If the front of the rack is not completely filled with components, the remaining gaps between the components
can cause changes in the airflow, which can adversely affect cooling within the rack. Cover these gaps with
blanking panels.
CAUTION: Always use blanking panels to fill empty vertical spaces in the rack. This arrangement
ensures proper airflow. Using a rack without blanking panels results in improper cooling that can
lead to thermal damage.
In high density configurations, the HP 10000 Series Rack Airflow Optimization Kit (AF090A) should be
installed to prevent airflow from the rear of the rack to the front the rack via gaps in the rack frame.
HP 10000 Series and 10000 G2 Series racks provide proper server cooling from flow-through perforations
in the front and rear doors that provide 65 percent open area for ventilation.
CAUTION: Always use blanks to fill empty spaces in enclosures. This arrangement ensures
proper airflow. Using an enclosure without the proper blanks results in improper cooling that can
lead to thermal damage.