Pre-requisites : How I Calculate Capacity for Systems Design – 1

Part 2: How I Calculate Capacity for Systems Design – 2

Capacity Estimation in System Design

Capacity estimation is essential to ensure that a system can handle its expected load and perform efficiently. It involves calculating the resources needed for processing/traffic handling, storage, and network bandwidth.

Key Rules for System Design Estimation Calculations

1. Rounding Approximations

   • Simplify calculations by rounding to more manageable numbers.
   • Example: Instead of calculating for 86,400 seconds in a day, use 100,000 (100K) seconds to simplify.

2. Powers of 2 and 10

   • Familiarize yourself with powers of 2 and 10 for quick estimations.
   • Example values for powers of 2: 2, 4, 8, 16, 32, 64, etc.
   • Example values for powers of 10:
     • (10^1 = 10)
     • (10^2 = 100)
     • (10^3 = 1,000)
     • (10^6 = 1,000,000) (1 million)
     • (10^9 = 1,000,000,000) (1 billion)
     • (10^{12} = 1,000,000,000,000) (1 trillion)

3. Metric System

   • Use metric system units for large numbers:
     • 1 million = (10^6)
     • 1 billion = (10^9)
     • 1 trillion = (10^{12})

4. Storage Capacity

   • Understand common storage units:
     • 1 KB = (10^3) bytes
     • 1 MB = (10^6) bytes
     • 1 GB = (10^9) bytes
     • 1 TB = (10^{12}) bytes
     • 1 PB = (10^{15}) bytes

• Storage Assumption

1. Key Metrics to Memorize

   • 1 million requests per day ≈ 12 requests/second
   • 1 million requests per minute ≈ 700 requests/second
   • 1 million requests per hour ≈ 4,200 requests/minute

2. Latency Numbers

   • Familiarize yourself with common latency benchmarks to make informed decisions during system design.

Note: Google for a table of latency benchmarks for more details.

Table for Powers of 2 and 10

Article 2: How I Calculate Capacity for Systems Design – 2

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