HP DL785 Error Prevention Guide - Page 9

Power disruptions take many forms, including power surges and sags, high-voltage spikes, switching transients, brownouts, and complete power failure. When a power disruption occurs, check the server for signs of data damage, data loss, file corruption, and hardware damage. The difficulty of dealing with power fluctuations is that the damage is not always immediately noticeable; thus, problems may not be noticed until long after the power disruption has occurred. Power management hardware like an uninterruptible power supply (UPS) minimizes the effect of power fluctuations and disruptions and is highly recommended. Preventing Power Management Problems When determining the power requirements for the server, consider the factors in this section. General Power Requirements Be sure that you are following the power requirements described in the server documentation. Also, the installation of the system equipment must be in accordance with local/regional electrical regulations governing the installation of information technology equipment by licensed electricians. For electrical power ratings on options, refer to the rating label on the product or user documentation supplied with that option. Power Consumption Considerations Before configuring the server, you must evaluate power consumption requirements and determine the appropriate number of power supplies to be sure that the server has sufficient power capacity. In addition to determining the minimum power supply requirements, you must also consider whether AC power redundancy is a requirement, if applicable to the server. For more information on the specific power capabilities of the server, refer to the server documentation. To obtain the most accurate power capacity and assessment of power margin, use the power calculator provided on the ActiveAnswers website at http://activeanswers.compaq.com/aaconfigurator 10 Error Prevention Guide