# live migration

> migrating a virtual machine or application to other physical hardware without logically shutting it down

**Wikidata**: [Q4179813](https://www.wikidata.org/wiki/Q4179813)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Live_migration)  
**Source**: https://4ort.xyz/entity/live-migration

## Summary
Live migration is the process of transferring a virtual machine (VM) or application to different physical hardware without shutting it down, ensuring continuous operation. It is a specialized form of data migration focused on maintaining uptime during hardware changes. This capability is critical for managing infrastructure in virtualized environments.

## Key Facts
- Live migration is a subclass of **data migration**, specifically designed for virtualized systems.
- It operates **online**, meaning the process occurs without interrupting active operations.
- The term is documented on Wikipedia in **English** and **Russian**.
- It is identified by the **Freebase ID `/m/064262p`** and the discontinued **Microsoft Academic ID 2778710394**.
- Live migration has **2 sitelinks** across Wikidata-linked platforms.

## FAQs
### Q: What makes live migration different from standard data migration?
A: Live migration uniquely transfers virtual machines or applications to new hardware without requiring a shutdown, avoiding downtime. Standard data migration focuses on transferring stored data between systems, often requiring downtime.

### Q: Why is live migration important for cloud computing?
A: It enables seamless hardware updates, load balancing, and maintenance in cloud environments, ensuring high availability and reliability for users.

### Q: Is live migration limited to virtual machines?
A: While primarily associated with virtual machines, the concept can also apply to migrating applications, provided the underlying infrastructure supports the transfer without logical shutdown.

## Why It Matters
Live migration is a cornerstone of modern virtualization and cloud computing, solving the critical challenge of hardware maintenance and resource optimization without service disruption. By eliminating downtime during hardware transfers, it supports mission-critical applications, enables dynamic workload balancing, and reduces operational costs. This technology underpins flexible, scalable infrastructure models, making it indispensable for enterprises relying on always-on services. Its integration into platforms like VMware and Kubernetes highlights its role in advancing resilient, automated IT systems.

## Notable For
- **Zero-downtime hardware transitions**: Maintains application availability during physical host changes.
- **Virtualization essential**: A core feature of hypervisor platforms (e.g., VMware, Xen).
- **Cloud infrastructure reliance**: Critical for scaling and managing distributed resources in platforms like OpenStack.
- **Online operation**: Distinguishes it from offline migration methods requiring shutdowns.

## Body
### Definition & Function
Live migration transfers a running virtual machine or application between physical hosts, preserving its operational state. This process ensures continuity for end-users and applications, even during underlying hardware changes.

### Technical Context
- **Online Characteristic**: The migration occurs while the system remains active, leveraging networked storage and synchronized state transfers.
- **Virtualization Dependency**: Typically requires hypervisor support (e.g., VMware vMotion, Live Migration in Hyper-V).

### Relationship to Data Migration
As a **subclass of data migration**, live migration specializes in real-time transfer of compute workloads rather than static data. It addresses dynamic infrastructure needs, whereas traditional data migration focuses on storage relocation.

### Applications
- **Maintenance**: Enables hardware upgrades or repairs without service interruption.
- **Load Balancing**: Optimizes resource allocation by redistributing workloads across hosts.
- **Disaster Recovery**: Facilitates rapid failover to alternate hardware during outages.

### Specifications
- **Identifiers**: Freebase ID `/m/064262p`, Microsoft Academic ID `2778710394` (discontinued).
- **Documentation**: Primary coverage on English and Russian Wikipedia, with limited sitelink presence (2 total).

## References

1. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)