220-802 · Question #475
A technician is attempting to install a RAID 1 configuration. Which of the following is the MINIMUM amount of disks that can be used to create a RAID 1 array?
The correct answer is B. 2. RAID 1 is a mirroring configuration that duplicates data identically across drives. It requires exactly 2 disks at minimum to create one mirror pair.
Question
A technician is attempting to install a RAID 1 configuration. Which of the following is the MINIMUM amount of disks that can be used to create a RAID 1 array?
Options
- A1
- B2
- C3
- D4
How the community answered
(48 responses)- A4% (2)
- B92% (44)
- C2% (1)
- D2% (1)
Why each option
RAID 1 is a mirroring configuration that duplicates data identically across drives. It requires exactly 2 disks at minimum to create one mirror pair.
A single disk has nothing to mirror to and provides no redundancy, which is the core purpose of RAID 1.
RAID 1 works by writing identical data to two separate drives simultaneously, providing redundancy so that if one drive fails the other contains a full copy. This requires a minimum of 2 disks - one source and one mirror. There is no parity calculation involved, so no additional drives are needed beyond the pair.
Three disks exceed the minimum for RAID 1, though three-disk mirror sets are possible in some implementations.
Four disks exceed the minimum; RAID 10 (a nested level) uses four disks, but basic RAID 1 only requires two.
Concept tested: RAID 1 minimum disk requirement
Source: https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-fault-tolerance
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