Cauchy Erasure Coding vs. 3x Replication Economics
Financial and operational TCO models demonstrating 54% to 58% cost reductions in petabyte-scale storage.
Cauchy Erasure Coding vs. 3x Replication Economics
For enterprise storage architects and Chief Financial Officers, storage cost is dominated not by software licenses, but by the physical hardware footprint: drive acquisition, server chassis, rack space amortization, power, and datacenter cooling.
The True Cost of 1 Petabyte Usable
Assuming an enterprise blend of high-density SAS drives and NVMe cache amortized over 4 years at approximately $22 per raw TB per year (inclusive of power and cooling):
| Metric | 3x Full Replication | Ahmodi Profile (4+2) | Ahmodi Profile (8+3) | Ahmodi Profile (16+4) |
|---|---|---|---|---|
| Storage Efficiency | 33.3% | 66.7% | 72.7% | 80.0% |
| Raw Capacity Required for 1 PB | 3,000 TB | 1,500 TB | 1,375 TB | 1,250 TB |
| Physical 24TB Drives Required | 125 Drives | 63 Drives | 58 Drives | 52 Drives |
| Simultaneous Failures Tolerated | 2 Drives | 2 Drives | 3 Drives | 4 Drives |
| Annual TCO per Usable PB | $66,000 / yr | $33,000 / yr | $30,250 / yr | $27,500 / yr |
| Net Savings vs. Replication | Baseline (0%) | 50.0% | 54.2% | 58.3% |
10 Petabyte Fleet Multi-Year Financial Savings
For a 10 PB enterprise deployment (typical for banking archives, seismic surveys, or smart city telemetry):
3x Replication Cost: $660,000 / year (2.475 Million SAR)
Ahmodi (8+3) Cost: $302,500 / year (1.134 Million SAR)
─────────────────────────────────────────────────────────────
Net Annual Savings: +$357,500 / year (+1.34 Million SAR / year)
4-Year Fleet Savings: +$1,430,000 (+5.36 Million SAR)
Important
Greater Durability at Lower Cost: Ahmodi Profile (8+3) survives 3 simultaneous drive or rack crashes compared to only 2 in 3x replication, meaning enterprises achieve higher durability and availability while spending less than half on hardware.