Virtual machines benefits

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Presentation transcript:

Virtual machines benefits mutliple flavors - run a different OS in each VM provide for user preference legacy OS/application (run one VM with old OS/app to avoid porting) fault isolation / security OS in one VM crashes without taking the whole system down

Virtual machines benefits development/testing develop/test in one VM without affecting others migration - move a VM from one physical server to another load balancing fault recovery

Virtual machine monitor (hypervisor) Virtual machines approaches bare metals approach user apps client OS VM Virtual machine monitor (hypervisor) hardware

Virtual machines approaches hosted approach user apps client OS VM monitor user app … user app hose OS hardware also: dynamic recompilation of user and target OS code modify client OS to work with VMM (paravirtualization)

Virtual machines VM should mimic I/O, interrupts, etc. - but should run w/ limited privileges software simulate the actual machine => slow run directly on hardware but each privileged operation is trapped and simulated code VM with special assists

Virtual machines history 1964 - work starts on IBM CP-40 (control program for S/360 Model 40) 1966 - IBM CP-67 (control program for S/360 Model 67, virtual memory) 1972 - IBM VM/370 for S/370 computers 1988 - SoftPC for Apple and Sun systems 1999 - VMware

Virtual machines history (cont'd) today - Microsoft Virtual PC, VMware, and Xen are but three among many AMD provides AMD-V and Intel provides Intel-VT (will allow Xen to host Windows)