Estimation

Target

  • 1 billion registered user. Each free user has 1TB storage space.

  • Daily active user represents 20% of the entire user, namely 0.2 billion.

  • Each DAU uploads and downloads 4 file per day.

Throughput

  • Average and peak QPS.

# Average QPS
0.2 * 10^9 * 4 files / (24 * 60 * 60) = 10^4

# Peak QPS
2 * 10^4

Bandwidth

  • Suppose that each file uploaded/downloaded is 1MB.

Storage

  • Lots of files are duplicated (Videos, books, software installation packages). And most users won't use the entire space. Instead they typically only use 10% of the entire space.

  • The total space needed is

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