A paravirtualized operating system is an operating system (OS) that is modified to run in a paravirtualized environment that provides a software interface to virtual machines, similar but not identical to that of the underlying hardware. In paravirtualized mode, the guest OS is explicitly ported for the para application programming interface (API)...
Fault tolerance is the way in which an operating system (OS) responds to a hardware or software failure. The term essentially refers to a system’s ability to allow for failures or malfunctions, and this ability may be provided by software, hardware or a combination of both. To handle faults gracefully, some computer systems have two or more duplicate systems.
Fault tolerance software may be part of the OS interface, allowing the programmer to check critical data at specific points during a transaction.
Fault tolerance can include:
In general, 100% fault tolerance can never be achieved due to cost constraints.
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