HP EVA P6550 HP P6300/P6500 EVA User Guide (5697-2486, September 2013) - Page 214

Weights, dimensions and component CG measurements Cabinet CG dimensions are reported as measured from the inside bottom of the cabinet (Z), the leading edge of the vertical mounting rails (Y), and the centerline of the cabinet mounting space (X). Component CG measurements are measured from the bottom of the U space the component is to occupy (Z), the mounting surface of the mounting flanges (Y), and the centerline of the component (X). Determining the CG of a configuration may be necessary for safety considerations. CG considerations for CG calculations do not include cables, PDU's and other peripheral components. Some consideration should be made to allow for some margin of safety when estimating configuration CG. Estimating the configuration CG requires measuring the CG of the cabinet the product will be installed in. Use the following formula: ΣdcomponentW = dsystem cgW where dcomponent= the distance of interest and W = Weight The distance of a component is its CG's distance from the inside base of the cabinet. For example, if a loaded disk enclosure is to be installed into the cabinet with its bottom at 10U, the distance for the enclosure would be (10*1.75)+2.7 inches. Airflow and Recirculation Component Airflow Requirements Component airflow must be directed from the front of the cabinet to the rear. Components vented to discharge airflow from the sides must discharge to the rear of the cabinet. Rack Airflow Requirements The following requirements must be met to ensure adequate airflow and to prevent damage to the equipment: • If the rack includes closing front and rear doors, allow 830 square inches (5,350 sq cm) of hole evenly distributed from top to bottom to permit adequate airflow (equivalent to the required 64 percent open area for ventilation). • For side vented components, the clearance between the installed rack component and the side panels of the rack must be a minimum of 2.75 inches (7 cm). • Always use blanking panels to fill all empty front panel U-spaces in the rack. This ensures proper airflow. Using a rack without blanking panels results in improper cooling that can lead to thermal damage. Configuration Standards EVA configurations are designed considering cable length, configuration CG, serviceability and accessibility, and to allow for easy expansion of the system. If at all possible, it is best to configure non HP cabinets in a like manner. UPS Selection This section provides information that can be used when selecting a UPS for use with the EVA. The four HP UPS products listed in Table 29 (page 215) are available for use with the EVA and are included in this comparison. Table 30 (page 215) identifies the amount of time each UPS can sustain power under varying loads and with various UPS ERM (Extended Runtime Module) options. NOTE: The specified power requirements reflect fully loaded enclosures (14 disks). 214 Non-standard rack specifications