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► Para virtualization (Figure 7-3)<br />
– The guest OS accesses the hardware by using an API.<br />
– The guest OS must be adapted.<br />
Management Appl icatio n Appli cation Ap pli cation<br />
Dom0<br />
Guest OS<br />
(DomU)<br />
Hypervisor<br />
Hardware<br />
Figure 7-3 Para virtualization<br />
► Emulation/simulation (Figure 7-4)<br />
Generally emulation applies to the hardware, because it is no longer available or the<br />
hardware architecture is different.<br />
Ap pli cation<br />
Guest OS<br />
Figure 7-4 Emulation/simulation<br />
Guest OS<br />
(DomU)<br />
Hardware Emulation<br />
Operating System<br />
Hardware<br />
► Operating system-level virtualization (Figure 7-5)<br />
This classification is a server virtualization method where the kernel of an operating<br />
system allows for multiple isolated user-space instances, instead of one. An example is<br />
workload partitioning in AIX.<br />
Figure 7-5 OS system-level virtualization<br />
Guest OS<br />
(DomU)<br />
Appl icatio n Ap pli cation App lica ti on Ap pli cation<br />
vOS vOS vOS vOS<br />
Operating System<br />
Hardware<br />
Ap pli cation<br />
Guest OS<br />
H d E l ti<br />
Hardware<br />
Emulation/simulation<br />
Chapter 7. Virtualization 109
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