HP 3PAR StoreServ 7200 2-node HP 3PAR StoreServ 7000 Storage Site Planning Man - Page 19

NOTE: For information on options available for the Intelligent Series Rack, refer to the Rack Options Catalog at www.hp.com/go/rackandpower. For information on rack requirements and considerations, see the Best practices for HP Intelligent Series Rack Family white paper. Meeting Environmental Conditions HP recommends that you maintain a controlled environment with a high degree of cleanliness, close control of temperature and humidity, and infrequent access by personnel. CAUTION: The storage system operating environment must be free from continuous vibration and from dust and other environmental contaminants. Maintaining the Optimal Temperature The level of cooling required for the storage systems is quite different from the air-conditioning used in offices. Air conditioning systems for comfort are designed for the lower heat and higher moisture generated by the human body. In contrast, equipment has high heat output that is moisture-free (sensible heat). In comfort systems, sensible heat normally produces 60-70% of the load, whereas the dry heat of electronic equipment produces a sensible heat ratio of over 95%. Prior to installation, verify the operating site is equipped with a cooling system that can support all thermal emissions. Proper site layout is critical to ensure the ambient temperature near the intake of the system does not rise beyond the system specifications. Exceeding the maximum ambient temperature for any period negatively affects the reliability and performance of the system. Continued operation for extended periods under such conditions might actually cause the system to shut down. CAUTION: Heated air from nearby equipment should not exhaust into the front of the storage system. Use the following average and maximum thermal emissions of storage system components to estimate the cooling requirements for a storage system based on a specific system configuration. Table 9 Thermal Emissions of Components Component (Fully Populated) Controller node (pair)1 Average Thermal Emissions 2,164 BTU/hr (545.3 Kcal/hr) Maximum Thermal Emissions 3,004 BTU/hr (757 Kcal/hr) Drive enclosure (single) 3,657 BTU/hr (921.6 Kcal/hr) 4,973 BTU/hr (1,253.2 Kcal/hr) Drive enclosure (pair)2 7,314 BTU/hr (1,843.2 Kcal/hr) 9,946 BTU/hr (2,506.4 Kcal/hr) 1 Controller nodes can only be installed in pairs. 2 Storage systems require a minimum of two drive enclosure. However, additional drive enclosure can be installed individually. Storage systems can tolerate temperature and humidity fluctuations if the specified guidelines are understood and followed. Exposure to conditions outside the specified ranges may damage the system or its components. Before a system is powered on, the air entering the subsystem must be clean and within the ranges specified for temperature and humidity. The room humidity must be kept sufficiently low to prevent condensation on or within the subsystem, and must never exceed the limit specified in the subsystem environmental requirements tables, including transient humidity. The system must never be exposed to conditions that could cause internal condensation to occur within the subsystem. The air conditioning units should have controls monitoring thermal conditions underneath the floor. The optimal condition should be set to 1° C (34° F) with 5% relative humidity. Humidification is Meeting Environmental Conditions 19