When to Migrate to AWS: Signs Your Infrastructure Is Ready

Cloud migration to AWS is the process of moving applications, data, and IT infrastructure from on-premises data centers (or other cloud providers) to Amazon Web Services. While not every organization is ready to migrate, there are clear warning signs that your current infrastructure is becoming a liability — and equally clear indicators that you are ready to make the move.

Warning Signs Your Infrastructure Has Outgrown On-Premises

You Can't Scale Fast Enough

If provisioning new servers takes weeks instead of minutes, you are losing agility. On-premises scaling requires hardware procurement, data center space, network configuration, and OS deployment. In AWS, an Auto Scaling group can add capacity in under 90 seconds. If your business experiences seasonal demand spikes — or is growing unpredictably — the inability to scale elastically is a competitive disadvantage.

Hardware Refresh Cycles Are Painful

Server hardware has a 3-5 year useful life. If you are facing a major hardware refresh — especially for storage arrays, network equipment, or aging hypervisors — the capital expenditure often exceeds the cost of migrating to AWS and running there for 3+ years. This "forklift moment" is one of the most common migration triggers.

Your Disaster Recovery Plan Has Gaps

Many on-premises DR strategies are untested, outdated, or rely on a single secondary site. If your RPO (Recovery Point Objective) and RTO (Recovery Time Objective) targets are not being met — or have never been tested under realistic conditions — AWS offers multi-AZ and multi-region architectures that provide dramatically better resilience at lower cost than maintaining a secondary data center.

Maintenance Burden Is Consuming Your Team

If your IT team spends more than 40% of their time on infrastructure maintenance — patching, monitoring hardware, managing backups, troubleshooting network issues — they are not building capabilities that differentiate your business. Migrating to AWS shifts undifferentiated heavy lifting to Amazon, freeing your team for higher-value work.

Compliance Is Getting Harder

Regulations like HIPAA, SOC 2, PCI DSS, and CMMC are becoming stricter. AWS provides over 140 compliance certifications and a shared responsibility model that simplifies your compliance posture. If your current infrastructure makes audit preparation a multi-month ordeal, cloud migration can significantly reduce that burden.

Assessing Your Migration Readiness

Before committing to migration, evaluate these factors honestly:

• Application inventory: Do you have a complete catalog of applications, their dependencies, and their infrastructure requirements? Tools like AWS Application Discovery Service and Migration Evaluator can help build this.
• Network readiness: Do you have sufficient bandwidth for migration and ongoing hybrid connectivity? AWS Direct Connect or VPN connectivity should be planned early.
• Team skills: Does your team have AWS experience, or will you need training and partner support? Skill gaps are the #1 cause of migration delays.
• Licensing: Some software licenses (Microsoft, Oracle, VMware) have complex cloud licensing terms. Audit these before migrating to avoid surprise costs.
• Data gravity: Where does your data live, and what applications depend on low-latency access? Data-heavy workloads require careful migration sequencing.

Migration Approaches: The 7 Rs

AWS defines seven migration strategies, commonly called the "7 Rs." The right approach depends on your application:

Rehost (Lift and Shift)

Move applications to AWS with minimal changes. Use AWS Application Migration Service (formerly CloudEndure) to replicate servers as-is. This is the fastest path to cloud — typical timeline is 1-4 weeks per application — but does not take advantage of cloud-native features. Best for: legacy applications, databases, and workloads where speed matters more than optimization.

Replatform (Lift, Tinker, and Shift)

Make targeted optimizations during migration without changing core architecture. Examples: moving from self-managed MySQL to Amazon RDS, replacing on-premises load balancers with ALB, or containerizing applications in ECS. Typical timeline: 2-8 weeks per application. Best for: applications that benefit from managed services but do not need a full rewrite.

Refactor (Re-architect)

Redesign applications to be cloud-native — using serverless (Lambda, API Gateway), containers (EKS, ECS), managed databases (Aurora, DynamoDB), and event-driven architectures. This delivers the most long-term value but requires the most investment. Typical timeline: 2-6 months per application. Best for: core business applications where performance, scalability, and cost efficiency justify the investment.

Other Strategies

Repurchase: Replace with SaaS (e.g., move on-prem Exchange to Microsoft 365). Retire: Decommission applications you no longer need. Retain: Keep on-premises for now (mainframes, applications with hard dependencies). Relocate: Move VMware workloads to VMware Cloud on AWS.

Setting Realistic Timeline Expectations

Migration timelines vary dramatically based on scope. A realistic framework:

• Small environment (10-20 servers): 2-3 months including planning
• Mid-size (50-100 servers): 4-8 months with parallel workstreams
• Large enterprise (500+ servers): 12-24 months in phased waves

The most common mistake is underestimating the planning phase. Discovery and assessment alone should take 4-8 weeks for a mid-size environment. Rushing this phase leads to missed dependencies, application downtime, and cost overruns.

Plan Your Migration With Confidence

EFS Networks has guided dozens of organizations through AWS migrations — from initial assessment through post-migration optimization. Whether you are evaluating readiness or ready to start moving workloads, our cloud team can help you build a realistic plan. Learn about our cloud migration services or schedule a migration readiness assessment.