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explain about disk scheduling with neat diagram fcfs schedulingscan schedulingc-scan schedulingsstf schedulinglook
direct memory accessmany computers avoid burdening the main cpu with programmed io by offloading sine if this work to a special-purpose processor
interruptsthe hardware mechanism that enables a device to inform the cpu is called an interrupt the basic interrupt mechanism works as follows the
briefly discuss on io hardwarea controller is a collection of electronics that can operate a port a bus or a device a serial-port controller is an
indexed allocationindexed allocation bringing all the pointers together into one location the index block every file has its own index block which is
linked allocationwith linked allocation every file is a linked list of disk blocks the disk blocks might be scattered anywhere on the disk the
contiguous allocationthe contiguous-allocation method needs each file to occupy a set of contiguous blocks of the disk disk addresses explain a
explain about file allocation methodsthe main problem in direct-access nature is how to assign space to these files so that disk space if utilized
virtual file system serves two important functions1 it divides file-system-generic operations from their execution by defining a clean vfs interface2
virtual file systemsthe file-system execution having of three major layers the first layer is the file-system interface based on the open read write
explain root partitionthe root partitionwhich have the operating-system kernel and potentially other system files is mounted at boot time in
partitions and mountinga disk can be sliced into many partitions or a partition can multiple disks every partition can be either raw having no
explain system-wide open-file and per-process open-filethe system-wide open-file table have a copy of the fcb of each open file as well as other
what is super blocka partition control block have partitions details such as the number of blocks in the partition size of the blocks free-blocks and
explain a boot control blocka boot control block can have the information required by the system to boot an operating from that partition if the disk
briefly explain about file system implementationseveral on-disk and in-memory structures are used to execute a file system on disk the file system
explain a working of file control block a file control block fcb has information about the file containing ownership permission and location of the
explain working of the logical file systemthe logical file system manages metadata information metadata contains all of the file-system structure
why is rotational latency usually not considered in disk scheduling how would you modify sstf scan and c-scan to include latency optimizationmost
explain why sstf scheduling tends to favor middle cylinders over the innermost and outermost cylindersthe center of the disk is the location having
is disk scheduling other than fcfs scheduling useful in a single-user environment explain your answerin a single-user environment the io queue
what is indexed allocationevery file has its own block of pointers to the sectors of the
what is linked allocation as detailed in textdirectory has pointers to first and last blocks of file every block of file except last has pointer to
what is preallocation why do itallocating space for a file before making the file to allow for expansion this reserves space for a certain file so