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Storage Networking Fundamentals: An Introduction to Storage Devices, Subsystems, Applications, Management, and Filing Systems by Marc Farley

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Chapter 8

1: Why is data redundancy important?
A1: Answer: It provides protection from data loss.
2: What are three different forms of redundancy?
A2: Answer: Duplicate, parity, and delta (difference)
3: What's the first step in using delta redundancy?
A3: Answer: Make a complete copy of the data.
4: List four locations in the I/O path that could contain mirroring operators.
A4: Answer: Host software, HBAs, network systems, and subsystem controllers
5: Why can't two targets in a mirrored pair have different sizes (capacities)?
A5: Answer: File systems are designed to manage a single address space. This means that all storing (block) operations are duplicated within the boundaries of that address space.
6: How can mirroring improve system performance?
A6: ...

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