# Datacenter Architecture for Sankofa Phoenix

## Overview

Sankofa Phoenix requires a multi-tier datacenter architecture to support a 325-region global deployment. This document outlines the datacenter infrastructure that complements the edge implementation, providing core compute, storage, and blockchain services.

**Sankofa Phoenix** is the sovereign cloud platform of the **Sankofa** ecosystem, and this architecture document details the infrastructure that powers the platform.

## Architecture Tiers

### Tier 1: Core Datacenters (Hub Sites)

**Purpose**: Primary infrastructure hubs for blockchain consensus, core services, and regional coordination.

**Deployment**: 10-15 strategic locations globally
- North America: 2-3 sites (US-East, US-West, Canada)
- Europe: 2-3 sites (UK, Germany, France)
- Asia-Pacific: 2-3 sites (Singapore, Japan, Australia)
- Africa: 1-2 sites (South Africa, Kenya)
- Latin America: 1-2 sites (Brazil, Mexico)
- Middle East: 1 site (UAE)

**Infrastructure Requirements**:

#### Compute Infrastructure
- **Blockchain Validator Nodes**: 
  - 3-5 validator nodes per datacenter (for Byzantine fault tolerance)
  - High-performance CPUs (AMD EPYC or Intel Xeon)
  - 64-128GB RAM per node
  - NVMe storage for blockchain state (2-4TB per node)
  
- **Consensus Layer**:
  - Enterprise Ethereum Alliance (EEA) compatible blockchain
  - Proof of Authority (PoA) or Proof of Stake (PoS) consensus
  - Multi-party governance nodes
  
- **Core Services**:
  - Kubernetes control plane clusters (3 master + 5 worker nodes minimum)
  - Database clusters (PostgreSQL with replication)
  - Message queue clusters (Kafka/Redpanda)
  - Object storage (MinIO/Ceph S3-compatible)

#### Storage Infrastructure
- **Blockchain State Storage**: 
  - Distributed storage for blockchain ledger
  - 50-100TB per datacenter
  - High IOPS NVMe arrays
  
- **Application Data Storage**:
  - Primary storage: 500TB-1PB per datacenter
  - Backup storage: 2x primary capacity
  - Object storage: 5-10PB per datacenter
  
- **Storage Technologies**:
  - Ceph for distributed block/object storage
  - ZFS for high-performance local storage
  - MinIO for S3-compatible object storage

#### Network Infrastructure
- **Inter-Datacenter Connectivity**:
  - Dedicated dark fiber or high-bandwidth leased lines
  - Minimum 100Gbps links between core datacenters
  - Redundant paths for fault tolerance
  
- **Blockchain Network**:
  - Private blockchain network overlay
  - Encrypted peer-to-peer connections
  - Network segmentation for security
  
- **Public Connectivity**:
  - Multiple Tier-1 ISP connections
  - BGP routing for redundancy
  - DDoS protection and mitigation

#### Power and Cooling
- **Power Requirements**:
  - 2-5MW per core datacenter
  - N+1 UPS systems
  - Backup generators (72-hour fuel capacity)
  - Power distribution units (PDUs) with monitoring
  
- **Cooling**:
  - Precision cooling systems
  - Hot aisle/cold aisle containment
  - Liquid cooling for high-density compute
  - Environmental monitoring

### Tier 2: Regional Datacenters (Spoke Sites)

**Purpose**: Regional aggregation points, blockchain read replicas, and regional service delivery.

**Deployment**: 50-75 locations globally
- One per major metropolitan area
- Strategic locations for latency optimization
- Proximity to edge sites

**Infrastructure Requirements**:

#### Compute Infrastructure
- **Blockchain Read Replicas**:
  - 2-3 read-only blockchain nodes
  - Query optimization for regional access
  - 32-64GB RAM per node
  
- **Regional Services**:
  - Kubernetes clusters (3 master + 3 worker nodes)
  - Regional database replicas
  - CDN edge nodes
  - Regional API gateways

#### Storage Infrastructure
- **Regional Storage**:
  - 100-500TB primary storage
  - 200TB-1PB object storage
  - Blockchain state cache (10-20TB)

#### Network Infrastructure
- **Connectivity**:
  - 10-40Gbps links to core datacenters
  - Multiple ISP connections
  - Direct peering where available

#### Power and Cooling
- **Power Requirements**:
  - 500kW-2MW per regional datacenter
  - N+1 UPS systems
  - Backup generators (48-hour fuel capacity)

### Tier 3: Edge Sites (Existing Implementation)

**Purpose**: Low-latency compute at the network edge.

**Deployment**: 250+ locations globally
- Already documented in edge implementation
- Proxmox-based infrastructure
- Connected to regional datacenters

## Blockchain Infrastructure

### Enterprise Ethereum Alliance (EEA) Architecture

#### Blockchain Network Topology

**Consensus Layer**:
- **Validator Nodes**: Deployed in Tier 1 core datacenters
- **Consensus Algorithm**: Proof of Authority (PoA) or Proof of Stake (PoS)
- **Governance**: Multi-party governance model
- **Network Type**: Private/permissioned blockchain

**Use Cases** (Non-Cryptocurrency):
1. **Supply Chain Provenance**:
   - Track hardware components from manufacturer to deployment
   - Verify authenticity and compliance
   - Immutable audit trail

2. **Resource Allocation and Billing**:
   - Transparent resource usage tracking
   - Multi-party billing verification
   - Automated settlement

3. **Identity and Access Management**:
   - Sovereign identity verification
   - Cross-region identity federation
   - Access control policies

4. **Compliance and Auditing**:
   - Regulatory compliance tracking
   - Audit log immutability
   - Multi-party verification

5. **Service Level Agreements (SLAs)**:
   - Smart contracts for SLA enforcement
   - Automated compliance checking
   - Penalty/reward mechanisms

#### Blockchain Components

**Smart Contracts**:
- Resource provisioning contracts
- Billing and settlement contracts
- Identity verification contracts
- Compliance tracking contracts
- SLA enforcement contracts

**Blockchain Nodes**:
- **Full Nodes**: Core datacenters (complete blockchain state)
- **Archive Nodes**: Select core datacenters (complete historical state)
- **Read Replicas**: Regional datacenters (query optimization)
- **Light Clients**: Edge sites (minimal state, query only)

**Blockchain Storage**:
- **State Database**: LevelDB or RocksDB for current state
- **Block Storage**: Distributed across core datacenters
- **Archive Storage**: Long-term archival for compliance

**Blockchain Network**:
- **P2P Network**: Encrypted peer-to-peer connections
- **Network Overlay**: VPN or dedicated network for blockchain traffic
- **Consensus Communication**: Secure channels for validator communication

## Integration with Edge Infrastructure

### Data Flow

1. **Edge → Regional → Core**:
   - Edge sites collect metrics and events
   - Regional datacenters aggregate and process
   - Core datacenters store in blockchain and provide consensus

2. **Blockchain → Regional → Edge**:
   - Core datacenters maintain blockchain state
   - Regional datacenters cache frequently accessed data
   - Edge sites query regional replicas for low latency

3. **Cross-Region Communication**:
   - Blockchain provides trust layer for cross-region operations
   - Smart contracts enforce policies and agreements
   - Immutable audit trail for all cross-region transactions

### Service Integration

**Control Plane Services**:
- Kubernetes control planes in core and regional datacenters
- Crossplane for infrastructure provisioning
- ArgoCD for GitOps deployments
- All integrated with blockchain for audit and verification

**Monitoring and Observability**:
- Prometheus/Grafana in all tiers
- Metrics aggregated to core datacenters
- Blockchain stores critical events and state changes

**Identity and Access**:
- Keycloak/OkraID in core datacenters
- Blockchain for identity verification and federation
- Regional replicas for low-latency authentication

## Security Architecture

### Physical Security
- **Access Control**: Biometric access, visitor logs
- **Surveillance**: 24/7 monitoring, video recording
- **Environmental**: Fire suppression, flood detection
- **Compliance**: SOC 2, ISO 27001, regional compliance

### Network Security
- **Segmentation**: Network zones for different tiers
- **Encryption**: TLS/SSL for all connections
- **Firewall**: Next-generation firewalls
- **DDoS Protection**: Multi-layer DDoS mitigation

### Blockchain Security
- **Validator Security**: Hardware security modules (HSMs)
- **Key Management**: Secure key storage and rotation
- **Access Control**: Permissioned blockchain with role-based access
- **Audit Logging**: All blockchain transactions logged

## Disaster Recovery and Business Continuity

### Backup Strategy
- **Blockchain State**: Replicated across 3+ core datacenters
- **Application Data**: Multi-region replication
- **Backup Frequency**: Continuous replication + daily snapshots
- **Retention**: 7-year retention for compliance

### Failover Procedures
- **Automatic Failover**: For regional datacenters
- **Manual Failover**: For core datacenters with governance approval
- **Recovery Time Objective (RTO)**: < 4 hours for core, < 1 hour for regional
- **Recovery Point Objective (RPO)**: < 15 minutes

### Geographic Redundancy
- **Core Datacenters**: Minimum 3 active, 2 standby
- **Regional Datacenters**: N+1 redundancy per region
- **Edge Sites**: Automatic failover to adjacent sites

## Compliance and Governance

### Regulatory Compliance
- **Data Residency**: Regional data storage requirements
- **Privacy**: GDPR, CCPA, and regional privacy laws
- **Financial**: SOX compliance for billing/accounting
- **Industry**: HIPAA, PCI-DSS where applicable

### Blockchain Governance
- **Governance Model**: Multi-party governance board
- **Decision Making**: Consensus-based decision making
- **Upgrade Process**: Formal proposal and voting process
- **Dispute Resolution**: On-chain and off-chain mechanisms

## Cost Optimization

### Infrastructure Costs
- **Core Datacenters**: $2-5M per site (initial)
- **Regional Datacenters**: $500K-2M per site (initial)
- **Ongoing Operations**: 20-30% of initial cost annually

### Optimization Strategies
- **Right-Sizing**: Start small, scale based on demand
- **Reserved Capacity**: Long-term commitments for cost savings
- **Efficiency**: Power and cooling optimization
- **Automation**: Reduce operational overhead

## Deployment Phases

### Phase 1: Foundation (Months 1-6)
- Deploy 3 core datacenters (US, EU, APAC)
- Deploy blockchain network with initial validators
- Deploy 10 regional datacenters
- Integrate with existing edge infrastructure

### Phase 2: Expansion (Months 7-18)
- Expand to 6-8 core datacenters
- Deploy 30-40 regional datacenters
- Expand blockchain network
- Full integration testing

### Phase 3: Scale (Months 19-36)
- Complete 10-15 core datacenters
- Deploy 50-75 regional datacenters
- Full blockchain network deployment
- 325-region global coverage

## Monitoring and Management

### Datacenter Management
- **DCIM**: Data Center Infrastructure Management
- **Power Monitoring**: Real-time power usage and efficiency
- **Environmental Monitoring**: Temperature, humidity, airflow
- **Asset Management**: Hardware inventory and lifecycle

### Blockchain Monitoring
- **Node Health**: Validator and replica node status
- **Network Performance**: Latency, throughput, block times
- **Smart Contract Metrics**: Execution times, gas usage
- **Security Monitoring**: Anomaly detection, attack prevention

## Next Steps

1. **Site Selection**: Identify and secure datacenter locations
2. **Hardware Procurement**: Order and deploy infrastructure
3. **Blockchain Setup**: Deploy and configure blockchain network
4. **Integration**: Integrate with existing edge infrastructure
5. **Testing**: Comprehensive testing and validation
6. **Deployment**: Phased rollout following deployment plan

