The original headline is about how dedicated server benchmarks look great but production databases disagree, explaining why.

Short summary

Sequential storage benchmarks (fio, dd) don't predict real database performance because production workloads use random I/O at high queue depths, not sequential writes at depth 1. Real load adds filesystem overhead, RAID calculations, thermal constraints, and resource contention that synthetic tests ignore. Benchmark realistically: mix access patterns, test multiple queue depths matching expected concurrency, and include actual RAID configuration.

• •Sequential benchmarks mislead: production databases use random I/O at high queue depths, not sequential bulk writes
• •Real overhead ignored: filesystem durability, RAID parity, thermal limits under sustained load, concurrent process contention
• •Benchmark correctly: test with mixed access patterns, queue depths matching expected concurrent connections, and actual RAID setup

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