RAID Level 1: Mirroring

Let's discuss RAID level 1 and analyze it with respect to the capacity, reliability, and performance.

We'll cover the following

Our first RAID level beyond striping is known as RAID level 1, or mirroring. With a mirrored system, we simply make more than one copy of each block in the system; each copy should be placed on a separate disk, of course. By doing so, we can tolerate disk failures.

In a typical mirrored system, we will assume that for each logical block, the RAID keeps two physical copies of it. Here is an example:

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