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Part 5: Back-of-the-Envelope Estimation & Production Calculations (44 - 50)

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System Design (50 Qs)•Part 5: Back-of-the-Envelope Estimation & Production Calculations (44 - 50)

Estimating Memory Requirements for Multi-Tier Caching (80/20 Rule).

In Simple Words: Applying the Pareto Principle (80/20 Rule): $80%$ of total read traffic is generated by $20%$ of hot data.

  • If daily read volume is $100\text{ GB}$, your Redis cluster only needs to hold $20\text{ GB}$ in RAM to achieve an $80%$ cache hit ratio!
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Storage Capacity and Disk IOPS Sizing for 5-Year Projections.

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High Availability Sizing: 99.9% vs 99.99% ("Four Nines") Downtime Budgets.