SG0-001 · Question #584
An administrator is attempting to recover corrupted data from a four disk RAID group. However, the administrator does not know which RAID level was used. When investigating the volumes, the administra
The correct answer is D. RAID 10. In a four-disk RAID group where all data has a duplicate on two disks, RAID 10 (RAID 1+0) was in use, combining mirroring and striping for both performance and redundancy.
Question
An administrator is attempting to recover corrupted data from a four disk RAID group. However, the administrator does not know which RAID level was used. When investigating the volumes, the administrator notes that there is a duplicate of all data on two of the disks. Which of the following RAID levels was in use?
Options
- ARAID 0
- BRAID 5
- CRAID 6
- DRAID 10
How the community answered
(33 responses)- A3% (1)
- B15% (5)
- C6% (2)
- D76% (25)
Why each option
In a four-disk RAID group where all data has a duplicate on two disks, RAID 10 (RAID 1+0) was in use, combining mirroring and striping for both performance and redundancy.
RAID 0 uses striping without any redundancy, so there are no duplicate copies of data.
RAID 5 uses striping with distributed parity, where parity information is spread across all disks, not a full duplicate of all data on another disk.
RAID 6 uses striping with dual distributed parity, meaning two disks' worth of space are used for parity, not a full duplicate of all data across two disks.
RAID 10 (or RAID 1+0) combines mirroring (RAID 1) and striping (RAID 0). In a four-disk configuration, it typically forms two mirrored pairs, with data striped across these pairs, meaning every piece of data has a duplicate copy on another disk, effectively duplicating "all data on two of the disks" across the mirrored sets.
Concept tested: RAID levels and redundancy mechanisms
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