SK0-004 · Question #254
Which of the following BEST describes RAID 1?
The correct answer is A. Mirroring. RAID 1 is pure disk mirroring, writing identical data simultaneously to two or more drives so that any single drive can fully replace the other on failure.
Question
Which of the following BEST describes RAID 1?
Options
- AMirroring
- BStriping
- CStriping with parity
- DStriping with mirroring
How the community answered
(23 responses)- A91% (21)
- B4% (1)
- D4% (1)
Why each option
RAID 1 is pure disk mirroring, writing identical data simultaneously to two or more drives so that any single drive can fully replace the other on failure.
RAID 1 maintains an exact duplicate of all data on each member drive by writing every block simultaneously to both drives. If one drive fails, the remaining drive contains a complete, up-to-date copy and the system continues operating with no data loss and no rebuild calculation required.
Striping alone describes RAID 0, which splits data across drives for performance but provides zero redundancy - the opposite of RAID 1's design purpose.
Striping with parity describes RAID 5, which uses distributed parity calculations to enable single-drive recovery rather than the full duplication used in RAID 1.
Striping with mirroring describes RAID 10 (RAID 1+0), a four-drive nested configuration that adds striping on top of mirroring, not the simple two-drive mirror of RAID 1.
Concept tested: RAID 1 disk mirroring for data redundancy
Source: https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-fault-tolerance
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