ITPEC IP October 2020 Question 23

One computer run as if it were several servers, its resources shared out by demand — the merit of server virtualization.

Virtualization software (a hypervisor) runs several virtual machines on one physical server, each with its own OS and applications, as if each were a separate server. The physical CPU, memory and disk are divided among them and can be reallocated as demand changes: a busy virtual server gets more, an idle one less. Fewer physical machines are needed, which saves space, power and cost.

Answer (a)

Why not others:

• •(b) — plugging computer boards (blades) into a chassis and adding or removing them is a blade server; each blade is a physical computer
• •(c) — running a computer unconnected to others is stand-alone operation; virtual servers share one physical machine and are normally networked
• •(d) — several computers doing the same processing and cross-checking the results is a dual system, a configuration for reliability, not for sharing resources

Key rule: Virtualization turns one physical server into several logical ones; a blade server packs several physical computers into one chassis; a dual system duplicates processing to catch errors.

System Component · AI-written, may contain errors