Wasted time, frustration, financial loss, and the perception of failure can
all be avoided by simply being clear when using terminology.
Now that I??™ve established what I mean by the term disaster recovery, I??™ll clarify what
constitutes a disaster.
Disaster Categories
I find it useful to categorize various types of disaster. This isn??™t simply due to my compulsive
need to categorize (hey, I??™m a database guy). It??™s useful to understand exactly what is
meant by a media failure or a hardware failure and to appreciate what sort of events can
CHAPTER 1 n WHAT IS DISASTER RECOVERY? 5
cause them. I??™ll walk through each of the categories and offer some real examples that
I??™ve encountered over the years. Then I??™ll compare the categories in terms of the following
criteria:
??? Probability of occurrence
??? Predictability of the event
??? Overall impact (usually measured from a financial perspective)
nTip I find it useful to clearly identify the problem before even thinking about a solution. When looking at
a disaster scenario, be sure you know the root cause. If you don??™t, your solution might just be a Band-Aid on
a larger issue.
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