A power outage, however brief, can cause most data centers and businesses to grind to a halt. As a result, information, productivity and profit can be lost. Using an Uninterruptible Power Supply (UPS) is the easiest way to provide secure power to protect your mission critical systems. 
The UPS system protects against all types of power supply failures and disturbances. How does this work? By positioning the UPS system between incoming power supply and the load, when then the main power fails, the UPS system switches to the backup UPS batteries, ensuring an unbroken power supply is available to keep the critical load fully operational.
The need to properly size a UPS system is critical to its reliability and the systems need to be able to grow along with your data center. Data center managers need to make sure that in today's ever changing per-rack power demands - this is done correctly.
Recently Electronic Environments Corporation (EEC) Design/Build Manager, Jim Stark, offered his knowledge on the subject. I encourage you to check out the editorial at processor.com. You will find answers to questions such as:
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What are the main factors to consider when choosing the size of a UPS for a data center?
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What is important for readers to understand about VA ratings of UPSs?
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Are there different considerations for blade servers vs standard servers?
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And more...
Does anyone have additional recommendations for sizing a UPS system?
