SK0-003 · Question #162
Which of the following is a benefit of a hot spare?
The correct answer is C. Enhanced fault tolerance. A hot spare is a pre-installed, inactive drive within a RAID array that automatically takes over for a failed drive. Its primary benefit is to enhance fault tolerance by allowing for immediate, automatic rebuilds without manual intervention, thereby minimizing data exposure and d
Question
Which of the following is a benefit of a hot spare?
Options
- ALower cost
- BAllows two RAID 1 drives to simultaneously fail without losing any data
- CEnhanced fault tolerance
- DEnhanced performance
How the community answered
(29 responses)- A7% (2)
- C90% (26)
- D3% (1)
Why each option
A hot spare is a pre-installed, inactive drive within a RAID array that automatically takes over for a failed drive. Its primary benefit is to enhance fault tolerance by allowing for immediate, automatic rebuilds without manual intervention, thereby minimizing data exposure and downtime.
Hot spares add an extra drive to the system, increasing the initial hardware cost, not lowering it.
While hot spares improve fault tolerance, a single hot spare typically replaces one failed drive; it does not allow two simultaneous failures in a RAID 1 without data loss, as RAID 1 itself only tolerates one drive failure.
A hot spare significantly enhances fault tolerance in a RAID configuration because it automatically and immediately replaces a failed drive without requiring manual intervention. This allows the RAID array to begin rebuilding the data onto the hot spare as soon as a disk fails, reducing the window of vulnerability where a second drive failure could lead to data loss and minimizing system downtime.
A hot spare does not actively participate in data operations unless a drive fails, so it does not enhance performance.
Concept tested: RAID hot spare functionality
Source: https://www.redhat.com/sysadmin/raid-configurations
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