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Difficulty: EasyResilience, High Availability, and Redundancy

A network administrator needs to ensure that a critical database server remains operational without data loss or downtime if a single internal storage drive fails. Which of the following technical controls directly provides this internal drive-level fault tolerance?

  1. Redundant Array of Independent Disks (RAID) storage configurationAnswer
  2. B
    Scheduled daily off-site tape backups
  3. C
    Network load balancer configured in an active-passive pair
  4. D
    Asynchronous geographic site replication

Answer

Redundant Array of Independent Disks (RAID) storage configuration
A Redundant Array of Independent Disks (RAID) configuration provides immediate hardware fault tolerance by duplicating data or distributing parity across multiple physical drives. If a single drive fails, the server continues to function normally without interruption or data loss.

Step-by-Step Solution

1
Identify the primary requirement
The requirement calls for drive-level fault tolerance within a single server to prevent downtime during a hardware disk failure.
Understanding the scope of the risk (single disk failure inside one server chassis) narrows the optimal solution to storage fault tolerance.
2
Evaluate storage fault tolerance technologies
RAID combines multiple physical hard drives into a single logical unit to provide disk redundancy and parity.
If one drive fails in a fault-tolerant RAID setup, the server remains operational while the array rebuilds data.

Key Concept

Disk Redundancy and Fault Tolerance
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Topics

Resilience, High Availability, and Redundancy

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