SG0-001 · Question #169
A new DAS populated with ten 160GB drives is in a RAID6 configuration. Which of the following is the usable disk space?
The correct answer is B. 1.28TB. To calculate the usable disk space in a RAID6 configuration, subtract two drives for parity from the total number of drives and multiply the result by the size of each individual drive.
Question
A new DAS populated with ten 160GB drives is in a RAID6 configuration. Which of the following is the usable disk space?
Options
- A800MB
- B1.28TB
- C1.44TB
- D1.6TB
How the community answered
(39 responses)- A3% (1)
- B87% (34)
- C8% (3)
- D3% (1)
Why each option
To calculate the usable disk space in a RAID6 configuration, subtract two drives for parity from the total number of drives and multiply the result by the size of each individual drive.
800MB is a significantly incorrect calculation and too small for gigabyte-sized drives in a RAID array.
In a RAID6 configuration, two drives are dedicated to parity information, meaning they do not contribute to usable storage space. With 10 drives of 160GB each, 8 drives are available for data, resulting in 8 * 160GB = 1280GB. Converting 1280GB to terabytes (using 1TB = 1000GB, common for advertised disk sizes) yields 1.28TB of usable space.
1.44TB (1440GB) would imply nine usable drives (9 * 160GB), which is not the correct number for a RAID6 configuration with 10 drives.
1.6TB (1600GB) represents the total raw capacity of all ten drives, not the usable capacity after accounting for RAID6 parity.
Concept tested: RAID6 usable storage calculation
Source: https://learn.microsoft.com/windows-server/storage/disk-management/raid-levels
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