220-802 · Question #476
A technician is attempting to install a RAID 5 configuration. Which of the following is the MINUMUM amount of disks that can be used to create a RAID 5 array?
The correct answer is C. 3. RAID 5 uses block-level striping with distributed parity for fault tolerance. It requires at least 3 disks so parity data can be spread across all members.
Question
A technician is attempting to install a RAID 5 configuration. Which of the following is the MINUMUM amount of disks that can be used to create a RAID 5 array?
Options
- A1
- B2
- C3
- D4
How the community answered
(40 responses)- A3% (1)
- B5% (2)
- C90% (36)
- D3% (1)
Why each option
RAID 5 uses block-level striping with distributed parity for fault tolerance. It requires at least 3 disks so parity data can be spread across all members.
One disk cannot support striping or parity distribution, which are fundamental requirements of RAID 5.
Two disks cannot distribute parity separately from data - RAID 1 is the appropriate two-disk configuration.
RAID 5 stripes data and parity information across all disks in the array. With 3 disks, two disks hold data blocks and the parity for each stripe is written to the third, rotating across disks. This minimum of 3 allows one drive to fail and be rebuilt from the remaining data and parity without data loss.
Four disks exceed the minimum; while valid for RAID 5, they are not required, making 3 the correct minimum answer.
Concept tested: RAID 5 minimum disk requirement
Source: https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-fault-tolerance
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