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q polling for an io completion is able to waste a large number of cpu cycles if the processor iterates a busy-waiting loop several times before the
q why might a system utilize interrupt-driven io to manage a single serial port however polling io to manage a front-end processor such as a terminal
q the instance of handshaking used 2 bits a busy bit as well as a command-ready bit is it probable to implement this handshaking with only 1 bit if
q state three merits of placing functionality in a device controller rather than in the kernel and state three disadvantagesanswer three advantages
q presume that we agree that 1 kilobyte is 1024 bytes 1 megabyte is 10242 bytes and 1 gigabyte is 10243 bytes this progression carries on through
q it is occasionally said that tape is a sequential-access medium whereas magnetic disk is a random-access medium in fact the correctness of a
q if magnetic hard disks eventually have the same cost per gigabyte as do tapes will tapes turn into obsolete or will they still be needed describe
q in a disk jukebox what would be the result of having more open files than the number of drives in the jukeboxanswer two bad results could result
q remapping of bad blocks by sector sparing or else sector slipping could influence performance presume that the drive in subsequent exercise has a
q more than one disk drive is able to be attached to a scsi bus especially a fast wide scsi-ii bus can be connected to at most 15 disk drives
q the term fast wide scsi-ii signifies a scsi bus that operates at a data rate of 20 megabytes per second when it moves a packet of bytes among the
q is there any way to execute truly stable storage describe your answeranswer truly steady storage would never lose data the fundamental technique
q what are the tradeoffs concerned in rereading code pages from the file system versus using swap space to store themanswer if codes pages are
q why is it significant to balance file system io among the disks as well as controllers on a system in a multitasking environment answer a system
q how would utilize of a ram disk affect your selection of a disk-scheduling algorithm what factors would you require to consider do the similar
q why is rotational latency typically not considered in disk scheduling how would you alter sstf scan and c-scan to comprise latency
q describe why sstf scheduling tends to favour middle cylinders over the innermost and outermost cylindersanswer the middle of the disk is the
q is disk scheduling except fcfs scheduling useful in a single-user environment describe your answeranswer in a single-user environment the io queue
q the accelerating search for described in subsequent exercise is typical of hard-disk drives by contrast floppy disks and several hard disks
q researchers have recommended that instead of having an access list associated with each file specifying which users can access the file and how we
q consider a system that holds 5000 users presume that you want to allow 4990 of these users to be able to access one filea how would you denote this
q in some systems a subdirectory is able to be read and written by an authorized user just as ordinary files can bea explain the protection problems
q give an instance of an application in which data in a file should be accessed in the following ordera sequentiallyb randomlyanswera print the
q describe the purpose of the open and close operationsanswer the open operation notifies the system that the named file is about to become active
q could you replicate a multilevel directory structure with a single-level directory structure in which arbitrarily long names can be used if your