HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 150
Power Distribution Units (PDU/PDRU), Redundant power source., Number of cords to the AC source
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Power Distribution Units (PDU/PDRU) PDUs provide a sufficient number of receptacles for a large number of devices installed in a cabinet. A PDU connects to the site power source and distributes power to its ten receptacles. The disk array power cords are connected to the PDUs and each PDU is connected to a separate UPS. For high availability, two PDUs should be installed and connected to separate site power sources. PDUs come in a variety of heights, from five feet down to 19 inches. Because the 19-inch PDU is shorter, it can be installed both vertically and horizontally. The peak power requirements and PDU capacity affect the number of electrical devices that can be installed in a rack. For example, to install more than four disk enclosures in an HP legacy rack, you must upgrade from the older 3-foot and 5-foot PDUs to 19-inch PDUs. In addition to rack density, consider the following in choosing PDUs: • Redundant power source. To connect redundant power supplies to separate PDUs, install redundant PDUs. • Number of cords to the AC source. Using 30-amp PDRUs instead of 16-amp PDUs reduces the number of cords to the wall. • Future needs. Installing surplus PDU capacity allows you to add devices later. • In-rush margins. For installations that require four or more 16-amp PDUs, HP recommends HP 30-amp PDRUs (E7681A, E7682A) for their inherent in-rush protection. • On/Off switch support. Some PDU/PDRU options support the use of a single-point on/ off switch. See Table 18 and Table 19. 150 Power Distribution Units (PDU/PDRU)