Ed Finnell has just made the important point that these sites should be
separated by at least 10 miles (16 kilometers).
Sometimes this magic number needs reconsideration. The right value may be 30
or 50 miles (48 or 80.5 km). A shop located in the rural American Midwest may,
for example, need a more remote DR site because one so close would be too
likely to suffer hurricane damage in the same incident or lose power for the
same reason.
A client recently had such a problem, about which I had warned it; but I was
not happy to have my reputation as a Cassandra confirmed again.
John Gilmore Ashland, MA 01721-1817 USA
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