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Fault tolerance
Machine failures, Communication faults, storage device crashes, and decays of storage media should be tolerated by the system to some extent. A fault tolerant system must continue to function may be with degraded form when these failures are encountered. The degradation is able to be either in performance or functionality or both. The majority commercial systems provide only limited fault tolerance. Though, fault tolerant systems are difficult to implement and in the DEC VAX cluster, multiple computers are permitted to share a set of disks. If a system breaks down, users are able to still their information from another system. Though, if a disk fails after that all the systems will lose access.
reason for terminating a process
The hardware to support demand paging is as follows Page table: This table has the skill to mark an entry invalid though a valid-invalid bit or particular value of protectio
Q. Why is it complicated to protect a system in which users are allowed to do their own I/O? Answer: In earlier chapters we identified a distinction among kernel and user mod
Now let us present an implementation of a producer-consumer system using condition variables. This implementation works. dequeue() lock(A) while (queue empty) { wait(A, C)
Question: (a) The following table (table 1.0) gives the length of the CPU burst time in milliseconds of processes P 1 to P 4 . Assume the processes arrived in the order P 1 ,
What are the phases of background processing? Phases are:- Job Scheduling. Job Processing. Job Overview.
Define logical address and physical address. An address formed by the CPU is referred as logical address. An address seen by the memory unit that is the single loaded into the
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Explain the Alphabet and String A finite set of symbols is known as alphabet. An alphabet is frequently denoted by sigma, yet can be given any name. B = {0, 1} says B is an
What is spooling? Spooling overlaps the I/O of single job with the computation of other jobs.
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