Zero-downtime cloud migration of 40 critical hospital systems
Planned wave migration with zero clinical disruption and continuous EHR access.
- Client
- Regional Hospital Network
- Multi-facility Healthcare Provider (18 Hospitals)
- Location
- Western India
- Timeline
- 20 weeks across architecture, staging, and 4 scheduled waves
- Headline result
- 0 min
- Clinical downtime across all 4 waves
Overview
An 18-hospital network was running mission-critical Electronic Health Records (EHR), laboratory information, pharmacy, and billing systems on aged, co-located on-premise servers facing imminent hardware end-of-life. Nexasoft planned and executed a 4-wave cloud migration with active-passive shadow synchronization, ensuring round-the-clock clinical operations with zero minutes of unscheduled downtime.
The challenge
- Legacy Windows Server and Oracle environments hosting 40 interdependent systems.
- Absolute zero-tolerance for outage in emergency room triage, ICU, and surgical records.
- Strict data residency, DISHA regulations, and patient confidentiality mandates.
- Bandwidth constraints across remote tier-2 hospital locations.
What we built
- Architected landing zones on AWS and hybrid direct-connect pipelines with hardware IPsec VPN tunnels.
- Employed CDC (Change Data Capture) database replication to synchronize millions of patient records continuously.
- Executed cutovers during low-activity weekend windows with automated verification tests.
- Instituted end-to-end telemetry and automated health checks across all hospital endpoints.
Results
- Unscheduled downtime experienced across 18 hospitals
- 0 min
- Critical clinical and administrative systems successfully migrated
- 40/40
- Reduction in annual infrastructure and operational maintenance costs
- 34%
- Average EHR query latency achieved across all regional clinics
- < 2s
Architecture
- AWS Landing Zone with multi-account isolation and VPC peering.
- Database migration with AWS DMS & continuous replication.
- Terraform Infrastructure as Code (IaC) with automated rollback safeguards.
- SOC 2 and HIPAA-aligned security auditing with AWS CloudTrail and GuardDuty.
“Migrating hospital records without interrupting doctors or emergency admissions seemed near impossible. Nexasoft's rehearsals and automated failover gave our board complete confidence.”
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