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ADR-0002: Design scale target

Proposed
Status

proposed

Date

2026-03-09

Group

cross-cutting

Depends-on

ADR-0001

Context

Fundament must define its design scale to make informed architecture decisions. Components that work at 500 physical servers may not work at 50,000. The target determines which tools are viable and which operational models are required.

Options

Option 1: Single-org scale (up to 500 physical servers)

  • Pros: most tools work, small team viable

  • Cons: not relevant for national government platform

Option 2: Medium scale (up to 5,000 physical servers)

  • Pros: broad tool support, proven architectures available

  • Cons: insufficient for stated government ambition

Option 3: Hyperscale (up to 50,000 physical servers / ~2M logical CPUs)

  • Pros: meets government target (30-50% sovereign compute)

  • Cons: eliminates many tools, requires automation-first approach, dedicated DC network automation required

Decision

Design for 50,000 physical servers / ~2,000,000 logical CPUs, to be reached within 3 years. All architecture decisions must be validated against this target.

Consequences

  • Tools must be proven or credibly validated at this scale

  • Manual operations are not viable — everything must be automated

  • DC network automation is a first-class concern

  • Capacity management and monitoring must scale horizontally