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Difficulty: EasyStorage Drives and RAID Array Issues

A technician receives a system alert indicating that one hard drive in a four-disk RAID 5 array has failed, putting the array into a degraded state. Which of the following actions should the technician take to restore fault tolerance to the array?

  1. Replace the failed drive with a functional drive of equal or greater capacity and rebuild the array.Answer
  2. B
    Format all remaining drives in the array and restore data from a system backup.
  3. C
    Delete the degraded volume and convert the surviving drives into a RAID 0 striped set.
  4. D
    Run a disk defragmentation utility on the surviving drives to clean up corrupted sectors.

Answer

Replace the failed drive with a functional drive of equal or greater capacity and rebuild the array.
Replacing the single failed drive with a healthy disk of adequate capacity and initiating a rebuild utilizes distributed parity from the surviving drives to fully recover the array without data loss.

Step-by-Step Solution

1
Diagnose the array status and fault tolerance capability.
The RAID 5 array has sustained a single disk failure and is currently degraded but operational.
RAID 5 uses distributed parity across disks, allowing it to withstand the failure of one drive.
2
Identify the necessary hardware replacement.
Swap out the failed hard drive with a new drive matching or exceeding the failed disk's storage capacity.
Rebuilding parity data requires a functional target disk of adequate capacity.
3
Initiate the RAID rebuild process.
The RAID controller reconstructs missing data onto the new disk using parity information stored on the remaining operational disks.
This returns the array to an optimal state with full fault tolerance restored.

Key Concept

Restoring fault tolerance to a degraded RAID 5 array by hot-swapping/replacing the single failed drive and initiating a rebuild.
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Topics

Storage Drives and RAID Array Issues

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