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Mac OS X Server guest support – experimental; Memory ballooning (not available on Solaris hosts) RAM deduplication (Page Fusion) for Windows guests on 64-bit hosts; CPU hot-plugging for Linux (hot-add and hot-remove) and certain Windows guests (hot-add only) Deleting snapshots while the VM is running
These hypervisors run on a conventional operating system (OS) just as other computer programs do. A virtual machine monitor runs as a process on the host, such as VirtualBox. Type-2 hypervisors abstract guest operating systems from the host operating system, effectively creating an isolated system that can be interacted with by the host.
The guest operating systems do not need to be compliant with the host hardware, thereby making it possible to run different operating systems on the same computer (e.g., Microsoft Windows, Linux, or previous versions of an operating system) to support future software.
Guest OS SMP available Runs arbitrary OS Supported guest OS drivers Method of operation Typical use Speed relative to host OS Commercial support available Containers, or Zones Yes, over 500-way on current systems No Uses native device drivers Operating system-level virtualization
Note that OS/2 runs only as a guest on those versions of VirtualPC that use virtualization (x86 based hosts) and not those doing full emulation (VirtualPC for Mac). VirtualBox from Oracle Corporation (originally InnoTek, later Sun) supports OS/2 1.x, Warp 3 through 4.5, and eComStation as well as "Other OS/2" as guests. However, attempting to ...
Some well-known client hypervisors are VMware Workstation, VirtualBox and VirtualPC. Client hypervisors are categorized in two types: Type 1 (Bare metal): this type of client hypervisor runs directly on the host machine's hardware and serves as the host operating system, providing hardware access to guests via its own drivers. Also, it create a ...
External and guest authorization options are provided by VRDP as well. It does not matter which operating system is installed as a guest because VRDP is implemented on the virtual machine (host) level, not in the guest system. The proprietary VirtualBox Extension Pack is required.
As with KQEMU, VirtualBox runs nearly all guest code natively on the host via the VMM (Virtual Machine Manager) and uses the re-compiler only as a fallback mechanism – for example, when guest code executes in real mode. [22] In addition, VirtualBox did a lot of code analysis and patching using a built-in disassembler to minimize recompilation.