SK0-004 · Question #311
Which of the following RAID arrays performs mirroring of the disks first, then striping of the disks?
The correct answer is D. RAID 10. RAID 10 (also written RAID 1+0) mirrors data across pairs of drives first, then stripes data across those mirrored pairs. This order - mirror first, stripe second - is the defining characteristic that distinguishes RAID 10 from RAID 0+1. RAID 0+1 does the opposite: it stripes…
Question
Which of the following RAID arrays performs mirroring of the disks first, then striping of the disks?
Options
- ARAID 1
- BRAID 0+1
- CRAID 6
- DRAID 10
How the community answered
(20 responses)- A5% (1)
- D95% (19)
Explanation
RAID 10 (also written RAID 1+0) mirrors data across pairs of drives first, then stripes data across those mirrored pairs. This order - mirror first, stripe second - is the defining characteristic that distinguishes RAID 10 from RAID 0+1. RAID 0+1 does the opposite: it stripes first, then mirrors the stripe sets. RAID 1 is pure mirroring with no striping, and RAID 6 uses dual parity with striping but no mirroring. RAID 10 is generally preferred over RAID 0+1 because it offers better fault tolerance - in RAID 10, losing one drive per mirrored pair is survivable, whereas in RAID 0+1, losing one drive can take out an entire stripe set.
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