Lesson 1 of 4 · 25 min

Why RAID Exists: Objectives, Architecture, and Fault Model

Explain why storage systems use RAID for performance, capacity, and reliability; describe the external disk-like interface versus internal RAID components; and identify the fail-stop disk fault model used to reason about RAID behavior.

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Lesson explanation

Why RAID Exists: Objectives, Architecture, and Fault Model RAID exists because ordinary disks do not meet every storage goal by themselves. As explained in Chapter 38 and 44(1) (1), when we use a disk, we want it to be faster, larger, and more reliable. Indiv...

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