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Poll question of the day: How one goes about determining a good
"distance" between 2 data centers. One which is primary and one which
could be used as a DR site.
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Short answer: it depends on what kind of disasters you're concerned about.
We had our DR site 60 km from the primary site. That put us on different
major power grid, different telephone grid and reasonably well away from
the area of contamination from chemical/biological/nuclear threats. XRC
connections over T3 kept sites fairly well synchronized. Primary site in
downtown Chicago; DR sight at far edge of adjacent county. Both sites
highly secured physically, especially since 9/11. Unfortunately, senior
management chose to relax electronic security somewhat, against my
better judgement as security administrator.
Your mileage may vary.
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