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Zorluk: ZorResilience, High Availability, and Redundancy

An enterprise organization recently deployed a critical application database server equipped with redundant hot-swappable power supplies and a RAID 5 disk array to fulfill a high-availability SLA. Following a malicious script execution, essential database tables were logically corrupted and encrypted. The network administrator confirmed that all hard drives and hardware components remained fully operational with active green status indicators, yet data restoration from the local array was impossible. Which of the following best explains why this high-availability configuration failed to preserve data access, and what control should be implemented?

  1. RAID provides hardware fault tolerance against disk failures but does not protect against logical corruption; versioned offsite data backups are required.Cevap
  2. B
    RAID 5 lacks single-drive write protection when parity calculations fail; upgrading to a RAID 6 configuration is required to maintain availability during data corruption events.
  3. C
    The redundant power supplies failed to act as a corrective control against state changes; an inline uninterruptible power supply must be installed to reverse corrupted transactions.
  4. D
    Hardware redundancy controls ensure non-repudiation rather than integrity; implementing asymmetric digital signatures on disk controllers is required to roll back file changes.

Cevap

The correct answer states that RAID provides hardware fault tolerance against physical disk failures but does not protect against logical corruption, requiring versioned offsite backups to ensure data recovery.
The correct option highlights the fundamental distinction between high-availability fault tolerance and data backup recovery. RAID 5 provides redundancy at the hardware layer, allowing a system to stay online if a physical disk fails. However, because RAID transparently duplicates all write operations, logical corruption or malicious encryption is written across the array instantly. To recover from logical corruption, an organization must maintain independent, versioned backups separated from the live system.

Adım Adım Çözüm

1
Analyze the technical requirements and failure condition described in the scenario.
The server's physical disks and power supplies remained functional, but the data itself suffered logical corruption from a malicious script.
Identifying the root cause requires distinguishing between physical hardware component failure and logical data integrity loss.
2
Evaluate the capabilities of the existing redundancy control (RAID 5).
RAID 5 uses disk striping with distributed parity to tolerate the physical failure of a single drive without downtime.
Hardware fault tolerance mechanisms automatically write and mirror all disk operations—including corrupting commands—across all member drives.
3
Determine the optimal missing security control to satisfy business continuity requirements.
Isolated, versioned data backups (such as offsite, immutable, or point-in-time snapshots) allow restoring clean data prior to the corruption incident.
High availability/fault tolerance ensures continuous infrastructure uptime, whereas backups provide data recoverability after logical destruction.

Anahtar Kavram

High Availability and Fault Tolerance vs. Data Backup and Recovery
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Resilience, High Availability, and Redundancy

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