That system had multiple boards plugged into a memory-bus backplane, each board with processor(s), memory, and IO. com workhorse, the Enterprise 10000 (UE10000). Sun Microsystems (Oracle, now) famously did this with its. Some hardware is designed like a brick of chocolate that can be broken apart along various predefined fault lines, each piece a fully functional computer. I'll relate this to the cloud computing's IaaS/PaaS/SaaS levels later. Let's go through the levels, starting at the bottom. But that's starting to get ahead of the discussion. It's also necessary to not always dwell all that heavily on boundaries between hardware and software. Most types of virtualization allow hosting of several platforms on one physical or software resource, but that's not part of my definition because it's not universal it could be just one, or a single platform could be created spanning multiple physical resources. The adjectives in front of "platform" could have qualifiers: Maybe it's not quite idealized in all cases, and isolation is never total. Anything providing that, whether it's hardware, software, or a mixture, is virtualization. Mine is that virtualization is the creation of isolated, idealized platforms on which computing services are provided. I see five levels to that hierarchy right now, anyway I wouldn't claim this is the last word.Ī key to understanding this is to adopt an appropriate definition of virtualization. They're not only all in the same (boringly mundane) plane, they relate to one another hierarchically. Talking about the latter as a true case of virtualization may cause some head-scratching I think most people consign it to a different plane of existence than things like VMware. There's a hint that this is so in the gaggle of other situations where the word virtualization is used, such as desktop virtualization, application virtualization, user virtualization (I like that one I wonder what it's like to be a virtual user), and, of course, Java Virtual Machine (JVM). That's certainly a very important and common case, enough so that I covered various ways to do it in a separate series of posts but it's scarcely the only form of virtualization in use. There appear to be many people for whom the term virtualization exclusively means the implementation of virtual machines à la VMware's products, Microsoft's Hyper-V, and so on.
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