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Migration (virtualization)
In the context of virtualization, where a ''guest'' simulation of an entire computer is actually merely a software virtual machine (VM) running on a ''host'' computer under a hypervisor, migration (also known as teleportation) is the process by which a ''running'' virtual machine is moved from one physical host to another, with little or no disruption in service.
==Subjective effects==
Ideally, the process is completely transparent, resulting in no disruption of service (or downtime). In practice, there is always some minor pause in availability, though it may be low enough that only hard real-time systems are affected. Virtualization is far more frequently used with network services and user applications, and these can generally tolerate the brief delays which may be involved. The perceived impact, if any, is similar to a longer-than-usual kernel delay.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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