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Difficulty: EasyResilience, High Availability, and Redundancy

A system administrator is upgrading a mission-critical server to eliminate single points of failure. The server hardware is equipped with dual hot-swappable power supply units. To ensure continuous operation even if a primary utility feed fails, which of the following configuration controls should the administrator implement?

  1. Connect each power supply unit to an independent power circuit fed by a separate Uninterruptible Power Supply (UPS).Answer
  2. B
    Configure a RAID 1 mirrored disk array across the server's storage drives.
  3. C
    Implement active-passive load balancing at the web application gateway layer.
  4. D
    Schedule automated daily full system image backups to offsite cloud storage.

Answer

Connecting each power supply unit to an independent power circuit fed by a separate Uninterruptible Power Supply (UPS).
Connecting dual hot-swappable power supplies to independent electrical circuits and separate UPS units eliminates single points of failure at the power layer. If one power source or supply fails, the remaining supply maintains system power without causing downtime.

Step-by-Step Solution

1
Identify the potential single point of failure described in the scenario.
The risk is an electrical power circuit or power supply failure affecting server uptime.
Dual power supply units are present, but if both are plugged into the same power distribution source, an outage on that circuit will cause total downtime.
2
Evaluate hardware fault tolerance mechanisms for power infrastructure.
Connecting each PSU to distinct electrical circuits backed by independent UPS units guarantees redundant power paths.
If one circuit or UPS fails, the second PSU continues drawing power seamlessly without interruption.

Key Concept

Power Infrastructure Redundancy and Fault Tolerance
Estimated Time:1m 0s
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Topics

Resilience, High Availability, and Redundancy

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