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Protecting the Power Supply
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The single biggest failure point for any network is its power supply. If you don t have power, you can t run your computers. It seems pretty obvious, and most of us slap an uninterruptible power supply (UPS) on the order when we re buying a new server. However, this barely scratches the surface of what you can and should do to protect your network from power problems. You need to protect your network from four basic types of power problems:
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Local power supply failure Failure of the internal power supply on a server, router,
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or other network component
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Voltage variations Spikes, surges, sags, and longer-term brownouts Short-term power outages External power failures lasting from fractions of a
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second to several minutes
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Long-term power outages External power failures lasting from several minutes to
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several hours or even days Each type of power problem poses different risks to your network and requires somewhat different protection mechanisms. The level of threat that each one poses to your environment varies depending on the area where you are located, the quality of power available to you, and the potential loss to your business if your computers are down.
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Local Power Supply Failure
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Computer power supplies have made substantial gains in the last 10 years, but they are still one of the greatest risk points. All the power conditioning, uninterruptible power supplies, and external generators in the world won t help much if your server s power supply fails. Most servers these days either come with a redundant power supply or have the option of including one. Take the option! The extra cost associated with adding a redundant power supply to a server or critical piece of network hardware is far less than the cost of downtime if the power supply fails. We found this out the hard way recently our main server turned out to have a run of bad power supplies. The manufacturer knew about the problem, and replaced them without question. But if it hadn t been for the second power supply in it, we d have been down and out until the replacement got to us. As it was, the manufacturer also replaced the second power supply in the server without waiting for it to fail because it was part of the same batch of bad power supplies. If your server, router, or other piece of network hardware doesn t have the option of a redundant power supply, order a spare power supply for it when you order the original hardware. Don t count on the hardware manufacturer s four-hour response time, especially when you consider the cost to your business even if they actually repair the equipment in four hours. If you have a spare power supply in a well-marked cabinet where you can easily nd it, you can quickly and with minimal disruption replace the failed power supply and return the equipment to full functionality. Then you can afford to wait patiently for the manufacturer s service response.
NOTE E
Most major manufacturers use proprietary components in their servers. This usu-
ally means that you can t count on using an off-the-shelf component, such as a power supply, but must use one speci cally designed to t the particular brand and model of server you have.
REAL WORLD
It s Only Useful if You Can Find It!
aving a good supply of critical spares is a great idea, but sometimes reality intrudes. Storage can be the weak link here. Most server rooms are not nearly
as spacious as we would like them to be, and in the SBS world a server room may be little more than a lockable closet. If that s the case, make sure the closet has adequate, ltered ventilation and cooling servers produce a signi cant amount of heat and a poorly ventilated environment will greatly shorten the life of your server. Dust is the enemy of your server it will impede cooling and can actually short out electrical components. Server rooms should not have carpeting. And remove any printers from the area printers are dust generators.
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