HP DL740 Power basics for IT professionals - Page 24
Plugs and receptacles, Power trends and strategies
UPC - 808736765770
View all HP DL740 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 24 highlights
area of a data center to prevent the cascading effects of inrush, should a site experience a power loss. Plugs and receptacles Two types of power cords provide connections between server products and utility power: power cord assemblies and jumper cable assemblies. In general, power cord assemblies provide the main connection from the AC power outlet to the server equipment, and they meet the standards for the country from which they are ordered. (See Appendix C for complete information on NEMA and IEC standard plugs and sockets.) Jumper cable assemblies provide the power connection between a server and an intermediate device such as a PDU. Jumper cables universally employ IEC-type connectors, which are rated for handling both high-line and low-line voltage. A power cord assembly consists of a plug (male connector), a cord, and a receptacle (female connector) as shown in Figure 16. A jumper cable assembly generally consists of a pin-and-sleevestyle plug (male connector), a cord, and a receptacle (female connector). Figure 16. Power cord assembly Plug Receptacle Cord Power trends and strategies Power demand in data centers will continue to rise; the increasing power will result in increased heat and greater heat dissipation issues. Data centers will need to allow for growth in the amount of power supplied while continuing to focus on efficient use of existing power and cooling. An efficient data center will offer expandable and efficient computing resources with optimized power usage. Understanding the interaction between increased processor performance, greater storage requirements, and the demand for more power requires thoughtful decisions about how to optimize data center resources. To minimize downtime, IT organizations must plan for and configure redundant hardware and redundant power paths. Therefore, organizations will benefit if they migrate from using single power cords (which provide no redundancy) to two cords for two paths (one for capacity and one for redundancy), and then to four cords for four paths (two for capacity and two for redundancy). The best choice for an organization may be easier to identify by considering costs with a long-term view instead of a short-term view. By any industry measure, server power densities are rapidly increasing.3 In 2001, data centers averaged four to six servers (5U to 7U each) per rack with corresponding wattage levels of 1,500 to 3 "Moving Toward Meltdown," Computerworld, October 6, 2003, http://www.computerworld.com/hardwaretopics/hardware/story/0,10801,85639,00.html 24