SG0-001 · Question #560
Given that a particular de-duplication solution stores 1TB of data using only 140G of space, which of the following is the resulting de-duplication ratio?
The correct answer is A. 7:1. The de-duplication ratio is calculated by dividing the original amount of data by the amount of physical storage space it occupies after de-duplication.
Question
Given that a particular de-duplication solution stores 1TB of data using only 140G of space, which of the following is the resulting de-duplication ratio?
Options
- A7:1
- B10:1
- C70:1
- D100:1
How the community answered
(58 responses)- A93% (54)
- B2% (1)
- C3% (2)
- D2% (1)
Why each option
The de-duplication ratio is calculated by dividing the original amount of data by the amount of physical storage space it occupies after de-duplication.
To calculate the de-duplication ratio, divide the original data size by the stored data size: 1 TB (1000 GB) / 140 GB. This calculation results in approximately 7.14, which is commonly expressed as a 7:1 ratio.
A 10:1 de-duplication ratio would imply that 1 TB of data is stored in 100 GB of space (1000 GB / 10 = 100 GB), which is not the case here.
A 70:1 de-duplication ratio would mean that 1 TB of data is stored in approximately 14.3 GB of space (1000 GB / 70 ≈ 14.3 GB), which is incorrect.
A 100:1 de-duplication ratio would indicate that 1 TB of data is stored in only 10 GB of space (1000 GB / 100 = 10 GB), which significantly differs from the given figures.
Concept tested: Calculating data de-duplication ratio
Source: https://learn.microsoft.com/en-us/windows-server/storage/data-deduplication/overview
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