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What is virtual file system?
A Virtual file system switch (VFS) or Virtual file system is an abstraction layer on top of a more concrete file system. The purpose of a VFS is to permit for client applications to access different kinds of concrete file systems in a uniform way. A VFS is able to for illustration be used to access local and network storage devices transparently without the client application noticing the difference. Or it is able to be used to bridge the differences in Windows, UNIX file systems and Mac OS.
Forking is an important phase of Unix, critical to the support of its design strategies, which encourages the implementation of filters. In Unix, a filter is a process that reads i
Explain a boot control block A boot control block can have the information required by the system to boot an operating from that partition. If the disk does not have an operati
Q. Presume that a distributed system is susceptible to server failure. What mechanisms would be needed to guarantee the exactly once semantics for execution of RPCs? Ans
defination
What is Two-level directory In the two-level directory structure every user has own user file directory (UFD). When a user jobs begins or a user logs in, the system's master fi
why we say OS is a resource allocator and control program
Explain Deadlock Every process in a set of processes is waiting for an event which only a process in the set can cause.
Describe paging technique used in UNIX systems. When a process begin in UNIX, not every its memory pages are read in from the disk at once. In its place, the kernel loads into
Many early operating systems regarded processes as different timesharing users. The process abstraction is a popular way to organize concurrent programs, but it is not the only cho
Define what an assembler is An assembler is machine dependant.
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