The Distributed Availability Architecture (DAA) is CloudNexus's foundational compliance framework designed to guarantee data integrity, regional sovereignty, and continuous service availability across multi-cloud and hybrid environments. DAA enforces strict data partitioning, cryptographic verification, and automated failover protocols to meet enterprise-grade regulatory standards.
DAA v2.4 natively aligns with SOC 2 Type II, ISO 27001:2022, GDPR Article 30, CCPA, HIPAA BAA, and FedRAMP Moderate baselines. All controls are continuously audited via automated compliance pipelines.
Architecture Overview
DAA operates on a three-tier decentralized model that eliminates single points of failure while maintaining strict data locality controls. Each tier functions independently but synchronizes via encrypted consensus channels.
Core Design Principles
- Zero Trust Data Flow: All inter-service communication requires mutual TLS with short-lived certificates rotated every 15 minutes.
- Deterministic Failover: Health checks run across 3 independent planes (network, application, storage). Failover triggers only when 2/3 planes detect degradation.
- Immutable Audit Trails: All configuration changes, access events, and data mutations are written to append-only WORM storage with cryptographic hashing.
- Region Locking: Data residency policies are enforced at the hypervisor and storage controller level. Cross-region egress requires explicit cryptographic signing.
Compliance Control Mapping
| Framework | Control ID | DAA Implementation | Verification |
|---|---|---|---|
| SOC 2 Type II | CC6.1 | Logical access controls via RBAC & SSO | Continuous SIEM monitoring |
| ISO 27001 | A.12.3.1 | Automated backup integrity verification | Quarterly restore drills |
| GDPR | Art. 32 | End-to-end encryption + pseudonymization | Annual third-party audit |
| HIPAA | 164.312(a) | Audit controls with tamper-evident logging | Real-time alerting pipeline |
Encryption & Key Management
All data within the DAA framework is encrypted at rest and in transit. CloudNexus uses a hybrid key management approach combining customer-managed keys (CMK) and platform-managed envelope encryption.
{
"encryption_policy": {
"algorithm": "AES-256-GCM",
"key_rotation": "90d",
"transit_protocol": "TLS 1.3",
"envelope": true,
"kms_provider": "cloudnexus-vault",
"residency_enforcement": {
"strict_mode": true,
"allowed_regions": ["us-east-1", "eu-west-2"],
"cross_region_signing": true
}
}When CMK is enabled, CloudNexus never possesses the raw data keys. All cryptographic operations are performed via secure enclaves. Keys are never logged, transmitted in plaintext, or stored outside FIPS 140-2 Level 3 certified HSMs.
Availability Tiers & SLAs
DAA supports three availability tiers based on redundancy requirements and recovery objectives:
| Tier | Uptime SLA | RPO / RTO | Redundancy Model |
|---|---|---|---|
| Standard | 99.9% | 1h / 4h | Single AZ, cross-AZ backups |
| High Availability | 99.95% | 15m / 1h | Multi-AZ active-active |
| Enterprise DAA | 99.999% | <1m / <5m | Multi-region geo-redundant with automatic failover |
Audit & Continuous Verification
DAA architecture compliance is not a static certification but a continuous verification process. CloudNexus runs automated compliance checks every 6 hours across all production clusters.
If any infrastructure component deviates from the approved DAA baseline (e.g., encryption downgrade, unauthorized region egress, certificate expiry), the system automatically isolates the affected node and triggers a security incident workflow. Remediation requires dual-approval from compliance and engineering leads.
All audit logs are retained for 7 years minimum and are accessible via the CloudNexus Compliance Console or exported to customer SIEMs via FIPS-compliant APIs.