SG0-001 · Question #30
An array has five drives, and each drive is 300GB in capacity. If an administrator applies RAID 5, which of the following is the usable capacity of the five drives?
The correct answer is C. 1.2 TB. For an array with five 300GB drives using RAID 5, the usable capacity is 1.2 TB.
Question
An array has five drives, and each drive is 300GB in capacity. If an administrator applies RAID 5, which of the following is the usable capacity of the five drives?
Options
- A600 GB
- B900 GB
- C1.2 TB
- D1.5 TB
How the community answered
(29 responses)- A3% (1)
- C93% (27)
- D3% (1)
Why each option
For an array with five 300GB drives using RAID 5, the usable capacity is 1.2 TB.
600 GB would be the usable capacity for a 3-drive RAID 5 configuration (2 * 300GB) or other smaller configurations.
900 GB would be the usable capacity for a 4-drive RAID 5 configuration (3 * 300GB).
RAID 5 distributes parity information across all drives, dedicating the equivalent capacity of one drive for this parity. Therefore, with five 300GB drives, one drive's capacity (300GB) is used for parity, leaving (5-1) * 300GB = 4 * 300GB = 1200GB usable capacity. 1200GB is equivalent to 1.2 TB.
1.5 TB (1500GB) represents the total raw capacity of the five drives, not the usable capacity after accounting for RAID 5 parity.
Concept tested: RAID 5 capacity calculation
Source: https://learn.microsoft.com/en-us/windows-server/storage/disk-management/initialize-new-disks
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