HP ML150 ISS Technology Update, Volume 7, Number 9 - Page 1

ISS Technology Update Volume 7, Number 9 ISS Technology Update Volume 7, Number 9 Keeping you informed of the latest ISS technology Quick tips for differences in energy efficiency between online "double-conversion" technology and online "on-demand" technology ...1 Use iLO Advanced to capture server event video 2 HP Industry Standard Servers - a leader in industry standards for storage 4 Meet the Expert-Mark Fletcher (confessions of an ISS "hitman 6 Common SM CLP scripting commands for ProLiant server management, Part 2 7 Recently published industry standard server technology papers 13 Contact us ...13 Quick tips for differences in energy efficiency between online "doubleconversion" technology and online "on-demand" technology This quick tip first defines online "on-demand" technology and online "double-conversion" technology. It then contrasts the energy efficiency performance delivered by these two technologies, each of which uses a different method to ensure a reliable power source for continuous data center operations. Online "double-conversion" technology Online double-conversion is currently the technology that most data centers use for their uninterruptible power supply (UPS) systems. In this type of UPS, the inverter is always on; it continuously converts AC to DC and then DC to AC. This generates a pristine, or very low-distortion, sinusoidal waveform; however, efficiency is significantly lower than with online on-demand. Online "on-demand" technology...plus double conversion Online on-demand is an energy efficient technology that allows incoming power to connect directly to the load through protected circuits when the incoming power is within specifications. When the power is not within specifications, the doubleconversion technology takes over to regulate the incoming voltage to an acceptable level for the load. Both online on-demand and double-conversion modes protect the critical load from voltage fluctuations and from damaging transients that can originate at the utility. And in the event the power goes out completely, the energy from the battery is converted to provide power to the load until the utility returns service or until a graceful equipment shutdown becomes necessary. 1