SK0-003 · Question #15
Which of the following is the minimum number of drives required for a RAID 10 array?
The correct answer is B. 4. A RAID 10 array, which is configured as a stripe of mirrored sets, requires a minimum of four drives to create two mirrored pairs that are then striped together.
Question
Which of the following is the minimum number of drives required for a RAID 10 array?
Options
- A3
- B4
- C5
- D10
How the community answered
(57 responses)- A5% (3)
- B86% (49)
- C2% (1)
- D7% (4)
Why each option
A RAID 10 array, which is configured as a stripe of mirrored sets, requires a minimum of four drives to create two mirrored pairs that are then striped together.
Three drives are insufficient for a RAID 10 array because it requires at least two independent mirrored pairs, each demanding two drives.
RAID 10 (RAID 1+0) is architected by taking at least two RAID 1 (mirror) sets and then striping data across these sets (RAID 0). Since each RAID 1 set requires a minimum of two drives, forming two such sets to be striped necessitates a total of four drives (2 drives per mirror x 2 mirror sets).
Five drives are more than the minimum required for a RAID 10 array; the smallest configuration for RAID 10 is possible with just four drives.
Ten drives are well beyond the minimum requirement for a RAID 10 array, which can be configured with as few as four drives to achieve its striped-mirror structure.
Concept tested: RAID 10 minimum drive requirements
Source: https://www.dell.com/support/manuals/en-us/perc-h730p-mini/perc_users_guide/supported-raid-levels?guid=guid-33758b29-b4b6-4b68-b769-02bb147514a4
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