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🖥️ '''Server virtualization''' is a technology that allows a single physical server to be partitioned into multiple isolated [[Definition:Virtual machine (VM) | virtual machines]], each running its own operating system and applications as though it were a standalone computer. Within the insurance industry, server virtualization has been a foundational technology enabling carriers to consolidate sprawling hardware estates — often accumulated over decades of [[Definition:Core system | core system]] deployments, [[Definition:Merger and acquisition (M&A) | acquisitions]], and departmental IT projects — into more manageable, cost-efficient environments. By decoupling software workloads from the physical hardware they run on, virtualization gives insurance IT teams far greater flexibility in how they allocate computing resources across [[Definition:Policy administration system (PAS) | policy administration]], [[Definition:Actuarial modeling | actuarial modeling]], [[Definition:Data warehouse | data warehousing]], and other critical functions.

🔧 The technology works through a layer of software called a hypervisor, which sits between the physical hardware and the virtual machines it hosts. The hypervisor — products such as VMware vSphere, Microsoft Hyper-V, and the open-source KVM are widely deployed across insurance data centers — manages the allocation of CPU, memory, storage, and network resources to each virtual machine according to configured policies. An insurer might run dozens of virtual machines on a single physical server: one hosting a test instance of a [[Definition:Claims management system | claims system]], another running a [[Definition:Billing system | billing]] application, and others supporting [[Definition:Regulatory reporting | regulatory reporting]] tools or internal web services. Virtual machines can be created, cloned, snapshotted, and migrated between physical hosts with minimal downtime — capabilities that dramatically improve [[Definition:Disaster recovery | disaster recovery]] planning, since an entire virtualized workload can be replicated to a secondary site and brought online rapidly. This portability also simplifies [[Definition:Release management | release management]], as new software versions can be tested on cloned virtual environments that exactly mirror production.

📈 The widespread adoption of server virtualization across the insurance sector — beginning in earnest in the mid-2000s and now nearly universal — set the stage for the industry's subsequent move toward [[Definition:Cloud computing | cloud computing]]. The conceptual leap from running virtual machines on owned hardware to running them on a provider's hardware in a [[Definition:Public cloud | public]] or [[Definition:Private cloud | private cloud]] was relatively small, and many insurers' initial cloud migrations were essentially extensions of their existing virtualization strategies. Beyond enabling cloud readiness, virtualization delivered immediate operational benefits: reduced hardware spending, lower energy consumption in [[Definition:Data center | data centers]], faster provisioning of development and testing environments, and improved utilization rates for expensive server assets. For insurers managing complex, multi-system technology landscapes — common among large multiline carriers and global [[Definition:Reinsurer | reinsurers]] — server virtualization remains a critical infrastructure capability, even as containerization and [[Definition:Microservices architecture | microservices]] architectures introduce newer paradigms for workload management.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Virtual machine (VM)]]
* [[Definition:Cloud computing]]
* [[Definition:On-premises infrastructure]]
* [[Definition:Private cloud]]
* [[Definition:Disaster recovery]]
* [[Definition:Data center]]
{{Div col end}}

Definition:Server virtualization - Revision history

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