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SQL Server on Azure Local runs inside Windows Server or Linux virtual machines on infrastructure you own and operate. The database workload stays on that local infrastructure; when the environment is connected, Azure Arc can provide supported cloud-based management without moving database execution or storage to Azure.
What is SQL Server on Azure Local?
It is SQL Server deployed in virtual machines on Azure Local infrastructure at your site or edge location—not a cloud-hosted database engine relocated transparently to Azure. Microsoft describes the product as SQL Server workloads running on Windows Server or Linux VMs in your own infrastructure. Microsoft’s overview also explains that database workloads continue to run locally while Azure services provide management capabilities.
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This arrangement is intended for organizations that need local data processing or data residency, want low-latency access near users or equipment, or are modernizing SQL Server while retaining their databases on premises. It combines customer-operated infrastructure and SQL Server with optional Azure-connected management experiences.
How does SQL Server on Azure Local work?
The architecture has three main layers: physical Azure Local infrastructure, virtual machines hosting SQL Server, and—when connected—Azure services used for management. The Azure Local platform also uses Azure Arc components for certain Azure-based lifecycle operations in connected deployments.
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1. Physical infrastructure and Azure Local
Azure Local runs on hardware validated for the platform. In Microsoft’s baseline architecture, physical machines provide Hyper-V compute, Storage Spaces Direct capacity, and failover clustering. Network design, hardware selection, and capacity must follow the supported deployment design and match the workload. Microsoft’s baseline reference architecture covers a particular multi-machine design spanning 2 to 16 machines; that is the scope of that baseline, not a universal sizing rule. Its two-machine storage-switched example calls for at least 11 IP addresses, also an example rather than a general requirement.
2. Virtual machines and SQL Server
Hyper-V hosts VMs on Azure Local. You create a Windows Server or Linux VM, then install SQL Server in that guest operating system. The VM is where the database workload executes; Azure Arc does not run the database remotely. Guest OS, SQL Server, and workload-specific protection remain part of the solution’s operational design.
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3. Azure-connected management
When Azure connectivity is configured, Azure Arc can represent supported resources in Azure for management experiences such as inventory, governance, monitoring, security, and licensing. The exact capabilities depend on the connected resource and service. These are management functions: they do not move SQL Server execution or its stored data to Azure. Azure-hosted management services themselves remain in the cloud.
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Can SQL Server run on Azure Local without internet?
Microsoft documents both connected mode and disconnected operations. Disconnected operations are designed for environments without an ongoing dependency on the public-cloud control plane, including restricted-connectivity, regulated, remote, or air-gapped settings. The SQL Server extension for Azure Arc is not supported for SQL Server on Azure Local in disconnected operations. As a result, its SQL inventory, best-practices assessment, and Azure SQL Server management experiences are unavailable there. Plan local tools and operating procedures for those needs.
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For the connected SQL Server architecture, the Azure Connected Machine agent and SQL Server extension communicate with Azure services over outbound HTTPS on TCP 443 using TLS. Some connected services, including Defender for Cloud and best-practices assessment, also require Azure Monitoring Agent connected to a Log Analytics workspace. Those are requirements for the connected management path, not a claim that disconnected operation requires Azure connectivity. Microsoft’s Azure Arc-enabled SQL Server overview describes the supported connection and agent requirements.
How does Azure Arc fit into SQL Server on Azure Local?
Azure Arc provides supported Azure-connected management for SQL Server resources; it is not the database engine, a substitute for local infrastructure, or a SQL Server high-availability mechanism. In connected mode, Azure Arc can support centralized visibility and management. Microsoft’s current overview marks connected mode generally available. In disconnected operations, the SQL Server Arc extension limitations described above apply. Check current service support and prerequisites when planning a deployment because capabilities can change. SQL Server on Azure Local overview
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How should availability, backup, and disaster recovery be designed?
High availability (HA) and disaster recovery (DR) require a workload design in addition to Azure Local’s host-level resilience. Choose protection according to recovery point objective (RPO), the acceptable amount of data loss, and recovery time objective (RTO), the acceptable time to restore service. Consider node failure and site failure separately, and decide whether failover should be automatic or manual.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstall| Option | What it protects | Important design point |
|---|---|---|
| Windows Server failover clustering | Clustered SQL Server VMs and platform-level availability | Microsoft’s deployment guidance describes using cluster anti-affinity rules to place relevant VMs on different physical nodes, and an Azure Cloud witness for quorum control. |
| Always On Availability Groups | User databases through primary and secondary replicas | Synchronous commit suits nearby, low-latency replicas; asynchronous commit can suit more distant replicas with higher latency. |
| Always On failover cluster instances | A SQL Server instance using shared cluster storage | Microsoft describes this option with shared Storage Spaces Direct storage. |
| Backups | Recovery to saved points in time | Backups provide recovery points but do not, by themselves, provide rapid failover. |
| Replication | Data distribution or support for DR | Replication does not automatically fail over entire databases. |
These approaches can be combined; none should be treated as a universal solution. Where recovery requirements call for it, design a recovery copy outside the Azure Local instance. Azure Arc can add visibility and management for supported connected SQL Server resources, but SQL Server’s native HA and recovery mechanisms do the workload protection. Microsoft’s Azure Local resiliency guidance describes these SQL Server options.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What does deployment involve?
Microsoft’s deployment guidance for Azure Local version 23H2 follows this sequence. The version-specific page is a deployment reference, so confirm current instructions and support requirements before implementation.
- Select validated hardware: Choose an integrated, premium, or validated system from the Azure Local catalog. Work with an OEM or systems integrator to size the solution; do not assume an arbitrary server model is supported.
- Deploy Azure Local: Configure the physical system, networking, storage, and platform according to the validated design.
- Create a guest VM and install SQL Server: Use a Windows Server or Linux VM, then install and configure SQL Server within it.
- Plan operations and protection: Monitor and tune the workload, and configure availability, backup, and recovery to meet its RPO and RTO.
See Microsoft’s SQL Server on Azure Local version 23H2 deployment guidance and the Azure Local baseline architecture. Hardware validation, service features, and support matrices may change; verify the current catalog and requirements for the intended workload.
When is this architecture a good fit?
- Local processing or data location matters: The SQL Server workload and its data remain on customer-site infrastructure.
- Low latency to local users or equipment matters: The workload can execute near the systems that use it.
- Hybrid management is useful: A connected deployment can use supported Azure Arc management experiences alongside local execution.
- Public-cloud connectivity is constrained: Disconnected operations are an option, but the Azure Arc SQL Server extension experiences are not available in that mode.
- Your team can operate the stack: The design involves customer responsibility for physical hardware, guest operating systems, SQL Server, and workload-specific availability and recovery.
Compare those needs with a public-cloud database deployment and assess connectivity, sovereignty, latency, operational ownership, validated hardware, scale, and recovery objectives. The available documentation does not establish a universal performance advantage or cost saving for SQL Server on Azure Local; those outcomes depend on the specific workload and design.
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