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Whatever your outlook is, let??™s take
things one step at a time and simply identify potential disasters.
I previously said these categories revolve around the likelihood of occurrence, the
predictability of an event, and the impact of the failure. Table 1-1 summarizes the category
breakdown.
Table 1-1. Probability, Predictability, and Impact of Various Failure Types
Failure Type Probability Predictability Impact
Environment Very low Natural disasters are Usually catastrophic.
impossible to predict,
but a poorly constructed
server room
may be an entirely different
matter.
Hardware Low Some server monitoring Downtime and data loss; how
tools warn of impending much depends on what failed.
failure.
Media Low Most RAID controller soft- Ranges from relatively no
ware provides some impact when losing a single
means of predicting an RAID 5 drive to significant
impending drive failure. downtime and potential data
Type storage is rarely loss.
accessed, making it
extremely difficult to
predict impending failure.
Continued
CHAPTER 1 n WHAT IS DISASTER RECOVERY? 9
Table 1-1.


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