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Launch day

Pixel runs on one large server: the web API and the database share srvW1. Today is launch day — at tick 20 traffic jumps from 80 to 400 requests a second, and at tick 40 srvW1 dies for good. Keep Pixel serving through both, under $600 a month.

20 minMedium

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What it checks

  1. 1Size app and database servers separately for a given mix of work.
  2. 2Predict how many servers a target load needs, given per-server capacity and headroom.
  3. 3Spot when adding app servers stops helping because a shared dependency is saturated.

Brush up first

More practice

  1. Keep it aliveOpen8 min