Estimation · Estimate
Users write 100 million posts a day, 300 bytes each (text and metadata, no media). How much storage do five years of posts need, before replication?
medium
Answer
About 55 TB. In review, anything from 27.5 to 110 counts as right.
The worked estimate
100M × 300 B = 30 GB a day. × 365 ≈ 11 TB a year. × 5 ≈ 55 TB. With three replicas that is about 165 TB, which still fits a modest cluster.
Numbers: Numbers to know.
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