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An uninterruptible power supply (UPS) protects against lost or corrupt data by giving the system time to save the data properly in the event of a power outage. A UPS can also prevent downtime in areas where power is unreliable or where downtime is unacceptable. Through the Windows NT/2000 UPS service, a UPS device can be configured to execute an automatic batch file if the power goes out, and/or to shut down the system completely. Table 5-4 is a brief index of vendors who offer power-related products. Contact any of the listed websites to request documentation on that company s UPS devices.
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Company American Power Conversion (APC) CyberPower Opti-UPS Power & Data Technology Power Protection Unlimited Powerware Systems Enhancement TCS Power Protection TSI Power Universal Power Systems
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Website www.apc.com www.cyberpower.com www.opti-ups.com www.powerdatatech.com www.upspower.com www.powerware.com www.sechq.com www.smartups.com www.tsipower.com www.upsi.com
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Table 5-4.
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Vendors of UPS Products
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Which machines in your network should have UPS protection In some cases, the answer is quite easy: Servers are relied upon by many users, and they store critical data, so they must be working properly at all times. In some cases, however, you might also want to protect any workstations that are running critical tasks or performing operations that take a long time. (Engineering workstations are a good example.) Additionally, if users are expected to have continuous access to system resources, you need to ensure that the necessary network devices routers, hubs, etc. remain active. There are several characteristics of a UPS that you should consider before making a purchase. The most important issue is the amount of power that the battery can provide. This value is often measured in volt-amps; it reflects how much power the unit can put out per unit time. To determine your power requirements, you should refer to your hardware documentation. (Some UPS vendors provide information on common hardware devices at their websites.) You ll need to determine how many of your hardware devices, and of which kinds, can be adequately supported on a single UPS. Another consideration is the amount of time (usually measured in nanoseconds) that a UPS will take to react to a power outage. (Most units will kick in almost immediately.) Find out also whether the device you re buying comes with software drivers for supported platforms. These tools and utilities are extremely useful for monitoring and managing power supplies. Another important benefit of using UPS devices is that they automatically compensate for brown-outs (dips in power), spikes, and surges (short bursts of high energy), which might otherwise cause damage to costly computing equipment. UPS manufacturers can give you information regarding the level of protection that their products pro-
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vide. Most UPS manufacturers also offer some type of insurance for the devices protected by their products. For example, if you ve purchased a UPS to protect a network server, but the server is subsequently damaged by an electrical spike, the UPS vendor may reimburse you for the cost of replacing it. If you re depending on this type of protection, be sure that you understand the fine print in any such guarantee.
CAUTION: It is important that you take the time to read about which types of devices are (and aren t) supported by the UPS you ve chosen. A common way to destroy a smaller UPS, for example, is to plug in a laser printer! Although there is probably little business reason for connecting a laser printer to a UPS, the voltage required by certain types of printing devices during warmup can far exceed the maximum power output of a typical UPS.
Once you ve bought a UPS, it s extremely important that you test it before you incorporate it into your system. Most UPS units include buttons that can simulate power loss. (Of course, you could also just unplug the cord on the back of the device!) The battery backup within the UPS unit should come online within a few nanoseconds, thereby preventing the loss of any information or any downtime. And finally, even if you ve invested in UPS protection, you should ensure that you also have redundant circuits. In the event that multiple UPS units are plugged into a single electrical wiring loop, any failure in that loop will result in loss of power to all the machines connected to it. As always, it is very important to minimize the risks associated with single points of failure.
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