When Does It Go Down? — TechKnowSurge

About this interactive

The lesson's switch has two power supplies. When one dies, the other keeps it running: that is redundancy. But if replacing the dead supply means shutting the switch down, pulling it, fitting the new one and turning it back on, there is still downtime, just later. Hot swappable means a part can be pulled and replaced while the equipment is up and running. The lesson's mirrored server drives work this way: pull the dead drive, put in a new one, and the server rebuilds it on its own. It takes both to avoid downtime entirely. A hot-swappable part with no second one still takes the device down when it fails. Some parts of a device are hot swappable and some are not, so know which.

What you'll learn

Predict when a part failure causes downtime from whether the part is redundant and whether it is hot swappable: never, only for the repair, or as soon as it fails

Aligned to

CompTIA Security+

3.4 Explain the importance of resilience and recovery in security architecture.

Key terms

Hot Swappable: The ability to remove and replace a hardware component while the system remains powered on and operational, without requiring downtime.
Redundant Power Supply: A duplicate power supply unit installed in a device so that if one fails, the other maintains operation without interruption.
Mirrored Drive: A storage configuration in which data is duplicated across two or more drives, allowing a failed drive to be replaced and rebuilt without data loss or downtime.

Topics

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