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  3. May 2006

Re: Redundant Power

Rob,

Like anything else with redundancy, it's just a question of how far you can
afford to take it.  Unless you can provide it on all sorts of levels (2
UPSs, 2 independant power feeds, 2 power companies with independant
supplies, etc.) there's always a point of failure somewhere that will bite
you!
And it happens My old neighbor worked in just such a data center. Dual feeds, dual generators, dual UPS, then into a magic box that split the load. And one thing per circuit. One. Even if it was a modem if it tripped it's breaker, nothing else died.
Then one day they were searching for an open circuit on which to place a new outlet. They thought they had found an existing one that wasn't in use So they shut off the breaker and then tested it. It sill had power. Hmm, then what Doesn't have power? Some large important piece of the mainframe communications network, that's what. Only took them a day to recover! 

We humans can find a way to screw up ANY unbreakable solution.

 - Larry
rob@xxxxxxxxx

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