SG0-001 · Question #599
Which of the following RAID levels provides the BEST guarantee that data will be retained in the event of drive failure without requiring a rebuild?
The correct answer is B. RAID 1. RAID 1 offers the best guarantee of immediate data retention without a rebuild upon a single drive failure because it mirrors data exactly across two or more disks.
Question
Which of the following RAID levels provides the BEST guarantee that data will be retained in the event of drive failure without requiring a rebuild?
Options
- ARAID 0
- BRAID 1
- CRAID 3
- DRAID 5
How the community answered
(28 responses)- A4% (1)
- B93% (26)
- D4% (1)
Why each option
RAID 1 offers the best guarantee of immediate data retention without a rebuild upon a single drive failure because it mirrors data exactly across two or more disks.
RAID 0 (striping) provides no fault tolerance; data is lost if any drive fails.
RAID 1 (mirroring) ensures that data is written identically to two separate drives; if one drive fails, the data is immediately available on the mirrored drive without requiring a rebuild process.
RAID 3 (byte-level striping with dedicated parity) requires a rebuild process to reconstruct data from the remaining drives and parity when a drive fails.
RAID 5 (block-level striping with distributed parity) requires a rebuild process using the parity information to recover data when a drive fails.
Concept tested: RAID levels and fault tolerance
Source: https://learn.microsoft.com/en-us/windows-server/storage/disk-management/overview-of-raid
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