Capacity-Estimation-diagram.excalidraw

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Capacity Estimation — Estimation Pipeline Diagram

Text Elements

Traffic Estimation ^box1-label DAU, peak QPS, read:write ratio ^box1-detail

Storage Estimation ^box2-label record size x records/day x retention ^box2-detail

Bandwidth Estimation ^box3-label QPS x avg response size ^box3-detail

Memory / Cache ^box4-label 80/20 rule: cache = 20% of daily traffic ^box4-detail

Back-of-envelope: round to powers of 2, use order-of-magnitude ^summary-label

1 day = 86,400 sec ~ 100K ^tip1 1M users x 10 req/day = 100 QPS ^tip2

Excalidraw Data

Text Elements

Capacity Estimation Pipeline ^title

Traffic Estimation ^zdNa08ga

DAU, peak QPS, read:write ratio ^GAb2S6eB

Storage Estimation ^ZR42mWIF

record size x records/day x retention ^L47om04w

Bandwidth Estimation ^8V0rUxNK

QPS x avg response size ^uFt7dFa6

Memory / Cache ^GkDLheI9

80/20 rule: cache = 20% of daily traffic ^sIwAEXSL

Back-of-envelope: round to powers of 2, use order-of-magnitude ^sreDiE4i

1 day = 86,400 sec ~ 100K ^yw63hkFK

1M users x 10 req/day = 100 QPS ^bIjqAJ8k

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