220-1201 Practice Question: A technician is configuring a RAID array in a…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

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  RAID 0

  Why it's wrong here

  RAID 0, also known as striping, distributes data blocks across all drives in the array without any form of redundancy or parity. While this configuration offers the highest potential read/write performance by parallelizing I/O operations, it provides absolutely no fault tolerance. The failure of even a single drive in a RAID 0 array results in the complete and irrecoverable loss of all data across the entire volume, making it unsuitable for any scenario requiring data integrity.

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  RAID 1

  Why it's wrong here

  RAID 1, or mirroring, creates an exact, real-time duplicate of data on two separate drives. This configuration provides excellent fault tolerance, as the system can continue operating seamlessly if one drive fails, but it offers no performance improvement beyond that of a single drive. For a four-drive array, implementing RAID 1 would only utilize two drives for data storage, effectively wasting 50% of the available disk capacity and failing to leverage the full hardware potential for both performance and comprehensive redundancy.

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  RAID 5

  Why it's wrong here

  RAID 5 stripes data with parity across three or more drives, offering fault tolerance and good read performance. However, write performance is slower due to parity calculations, and it does not provide the same level of fault tolerance as RAID 10 (can only survive one drive failure).

• ✓

  RAID 10

  Why this is correct

  RAID 10 combines striping and mirroring, offering both high performance and fault tolerance. With four drives, it creates two mirrored pairs striped together, allowing up to two drive failures (one per mirror) without data loss.