Plan a successful on prem to Azure migration with proven strategies, Azure tools, best practices, and expert guidance for a secure cloud transition.
Have you ever wondered why so many enterprise cloud migrations start with a promise of cost savings? Too often, they end up in budget shocks and migration delays instead.
The secret answer is a de-risked strategy. Hurrying a migration may create more problems instead of fixing the existing ones.
In this blog post, we will explain the On-Prem to Azure Migration. We will cover assessing the workload, choosing the migration strategy, creating the Azure landing zone, and phasing the migration process.
On-Prem to Azure Migration involves moving several critical elements. The application software, servers, databases, and IT management are migrated to Microsoft Azure. Your data, identities, and physical machines are moved as well.
Because of this, your organization’s IT infrastructure is hosted and managed on Microsoft Azure. It no longer runs on in-house hardware.
With an increase in market demand, businesses have been finding it tough to retain their traditional infrastructure. Azure offers the following benefits.
An effective On-Prem to Azure migration begins by conducting an evaluation of all the workloads to understand their business value, complexity, and cloud readiness. Enterprise cloud programs typically use the complete set of migration R’s. Using the right approach for each application helps balance speed, cost, and modernization goals.
Rehosting, also known as “lift and shift”, involves moving applications to Azure without altering the application code in any significant way. With Azure Migrate, create server and VM replicas on Azure Virtual Machines.
Zero code changes
This is the fastest option for data center exits and time-sensitive migrations.
Refactoring is used to make selective changes such that the applications can leverage Azure’s managed services without having to rewrite everything. The approach adopted for deployment changes from IaaS to PaaS or container services.
Minimal to minor code changes
Eliminate OS patching, manual database back-ups, and VM maintenance without rewriting the application core.
They change the full application’s architecture by taking control of cloud-native services. This is the most flexible approach for the company.
Significant code modifications
Unlocks maximum cloud-native capabilities.
Migration of On-premises applications to Azure needs well-planned execution in order to prevent any interruption to business operations. A properly planned On-Prem to Azure migration will reduce any business risk, remove any technical debt, and give immediate cost benefits.
You must be aware of everything about your surroundings and requirements before proceeding with anything further. An inventory should be created for all your applications, databases, servers, storage, and networking. The inventory of IT assets, dependency of applications, business and technical requirements, and migration candidates need to be determined.
Start building the Azure landing zone. A good foundation will avoid costly mistakes. A typical landing zone includes:
Building this foundation first creates consistency across every migration wave.
Avoid doing one-time data center migrations. Group the workloads into migration waves considering factors like complexity, criticality, and network dependency.
Begin by migrating a non-critical isolated service (like a staging environment or utility service). This helps to validate your landing zone setup, pipeline automation, replication bandwidth, and process flows without any risk to the core business. After grouping the application using your Azure Migrate map dependencies.
Every migration wave plan must contain clear, non-negotiable rollback triggers. So even if the pilot migration fails, we can roll back easily and bring it back to the original without any data loss.
All migrations must undergo rigorous validation testing before the production team uses Azure. Validation verifies that the software operates properly and performs efficiently. The following tests should be carried out to test functional, performance, load, network connectivity, security, disaster recovery, and failover capabilities. It is necessary to ensure that the on-premises setup remains available as a backup till such time as the migration process gets the stakeholders' approval.
Guarantee the integrity of data, performance benchmarks, and continuity of operations via a validation process before shutting down the on-premises servers. Verify that the applications work as expected and are within the set performance benchmarks. The test has to encompass the following types of tests: functional, performance, network connectivity, security, failover tests, and User Acceptance Testing (UAT).
Now that the workloads are running in Azure, it’s time to look into excellence in operation, compliance, and savings.
Connect all your virtual machines, databases, and PaaS services to one Log Analytics workspace. Make use of Azure Monitor and Application Insights for Infrastructure monitoring, thresholds, and application performance from an end-user point of view.
Make use of Microsoft Defender for Cloud for continuous assessment of your infrastructure from a compliance standpoint. Close public SSH/RDP ports but enable encryption of data at rest and a zero-trust access model.
This is not where the journey ends; rather, this is the start. The next step after migration to Azure is optimization of the resources for better performance and efficiency. There are many ways to optimize the resources, which include right-sizing the virtual machines, optimizing the storage tiers, autoscaling, resource monitoring, and eliminating unused resources.
The final step in Azure migration is establishing ongoing governance and operations. Daily cloud operations should include security monitoring, backup, and compliance. By doing continuous security monitoring, identity and access management, backup and disaster recovery, Azure policy and governance, and cost monitoring and budgeting, build a secure Azure environment that supports future growth and modernization.
Selecting the right migration tool is as important as a migration strategy. Microsoft offers a range of services that focus on discovery and assessment; others specialize in data transfer or database modernization. The table gives a complete understanding of each tool’s purpose.
It is very tough to select between Azure Migrate and ASR during the migration of the workload.
Azure Migrate is preferred for discovering, assessing, and migrating servers into Azure. It works well for migration projects. Optimized for discovery, cost estimation, and rightsizing based on the performance history and planned cutovers.
The goal of this approach is BCDR. The core capability here is workload replication across environments in order to enable fast recovery of applications from downtimes.
Total Cost of Ownership (TCO) in Azure moves beyond simple server replacement to optimize compute, licensing, storage, and operational overhead. Azure works on a pay-for-the-resources-you-use model, so costs are reduced. To lower the total cost of ownership (TCO), right-size virtual machines, remove idle resources, and use managed services where possible.
Azure also offers savings by reusing existing Windows Server, SQL Server, and Linux licenses with active software assurance to cut compute costs by up to 80%. Regular cost monitoring with Azure Cost Management and Azure Advisor helps identify optimization opportunities and prevent unnecessary cloud spending.
Enterprise Azure governance relies on automated guardrails, identity controls, and continuous compliance tools to keep workloads secure. Armstrong governance and security are essential for a successful Azure migration. Define management groups, subscriptions, resource tags, and Azure Policy before migrating workloads.
Encrypt data at rest and in transit and use Azure Key Vault to safeguard secrets and certificates. It uses Microsoft Entra ID (Azure AD) to secure access using zero-trust principles, Conditional Access policies, and Role-Based Access Control (RBAC) to enforce least-privilege permissions. Monitor threats with Microsoft Defender for Cloud and Azure Monitor, and enable backup and disaster recovery for business continuity. Regular compliance reviews help meet industry standards and internal policies while supporting a secure, well-managed Azure environment.
Any migration comes with a lot of challenges. A well-planned On-prem to Azure migration will also fail if the following challenges are not noticed.
AI is changing the way enterprises approach on-prem to Azure migrations by automating time-consuming tasks such as workload discovery, dependency mapping, code analysis, and migration planning. Choosing a migration partner such as Entrans helps in identifying optimization opportunities, estimating migration effort, detecting configuration issues, and generating documentation.
So, along with AI-driven automation and expert guidance, we help organizations complete Azure migrations faster.
Want to know more about how we handle Azure migrations with greater accuracy, lower risk, and better long-term business outcomes?. Book a consultation call with us.
Begin with your assessment of the applications, the servers, and their dependencies. Conduct a readiness assessment of your current infrastructure. Pick a migration approach, for example, re-hosting, re-platforming, or refactoring. Use Azure Migrate to discover, assess, and migrate your workloads.
Azure uses the 7Rs approach to migration, which consists of Rehost - lift and shift, Replatform, Refactor, which is re-architecting to be cloud native, Repurchase, Retire, Retain, and Relocate. The correct choice of the strategy depends on several factors.
To connect your on-premises environment to Azure, use a site-to-site VPN for secure internet-based connectivity or set up a dedicated Microsoft ExpressRoute circuit. Choose an ExpressRoute circuit for high-speed private connections.
Use Microsoft Entra Connect to synchronize users, groups, and identities from Active Directory to Microsoft Entra ID. For legacy apps needing LDAP or Kerberos, use Microsoft Entra Domain Services. To go cloud-only, adopt Entra ID join and decommission on-prem AD once no app depends on it.
Use Azure Database Migration Service or Azure SQL Migration tools to move databases with minimal downtime. The best target depends on whether you choose Azure SQL Database, Azure SQL Managed Instance, or SQL Server on Azure Virtual Machines.
Use Azure Migrate to plan, assess, and permanently move workloads and databases into Azure. It is the purpose-built hub for discovery, assessment, and server migration. Azure Site Recovery is for disaster recovery, not migration, per current Microsoft guidance.
Yes. Using Azure Stack hardware allows you to run native Azure Cloud services and infrastructure inside your own data centers. This allows you to manage hybrid environments with consistent Azure tools and policies.
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