Configured properly, virtually isolated resources can provide more secure applications with no visible connectivity between environments. Each virtual device is represented within its software and user environments as an actual, standalone entity. Virtualization allows physical compute, memory, network, and storage (“core four”) resources to be divided between multiple virtual entities. Wherever possible, efficiently executes operations directly on underlying hardware resources, including CPUs.Allows complete client control over virtualized system hardware.Is equivalent to that of a physical machine so that software access to hardware resources and drivers should be indistinguishable from a non-virtualized experience.
Goldberg in a paper from 1974 (“Formal Requirements for Virtualizable Third Generation Architectures” - Communications of the ACM 17 (7): 412–421), successful virtualization must provide an environment that: Safely testing new configurations or full applications before their release can also be complicated, expensive, and time-consuming.Īs envisioned by pioneering researchers Gerald J.
The cost and complexity of building and launching a single physical server mean that effectively adding or removing resources to quickly meet changing demand is difficult or, in some cases, impossible. ĭespite having access to ever more efficient and powerful hardware, operations that are run directly on traditional physical (or bare-metal) servers unavoidably face significant practical limits. Excerpted from my book: Teach Yourself Linux Virtualization and High Availability: prepare for the LPIC-3 304 certification exam - also available from my Bootstrap-IT site.
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