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CompTIA Security+: SY0-601 Certification Guide - Second Edition
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It is important that companies have redundancy or fault tolerance built in so that they are protected from cyber attacks.
Redundancy is the process of when one part of a system fails but we have the ability to keep the system running. It could also be referred to as fault tolerance. Let’s begin by looking at the different types of redundancy that companies could deploy. We will start with disks and then move on to geographical dispersal.
There is a need for the disk setup on servers to provide redundancy, sometimes known as fault tolerance. In simple terms, this means that if one or more disks fail, the data is still available. There are different Redundant Array of Independent Disks (RAID) levels, so let’s look at each of these in turn, starting with RAID 0:
Figure 12.4 – RAID...
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