GATE CS I/O Scheduling questions

Consider an operating system capable of loading and executing a single sequential user process at a time. The disk head scheduling algorithm used is First Come First Served (FCFS). If FCFS is replaced by Shortest Seek Time First (SSTF), claimed by the vendor to give $50 \%$ better benchmark results, what is the expected improvement in the I/O performance …

Using a larger block size in a fixed block size file system leads to

Consider a disk with the $100$ tracks numbered from $0$ to $99$ rotating at $3000$ rpm. The number of sectors per track is $100$ and the time to move the head between two successive tracks is $0.2$ millisecond.

Consider a disk with the following specifications: 20 surfaces, 1000 tracks/surface, 16 sectors/track, data density 1 KB/sector, rotation speed 3000 rpm. The operating system initiates the transfer between the disk and the memory sector-wise. Once the head has been placed on the right track, the disk reads a sector in a single scan. It reads bits from the …

Which of the following requires a device driver?

Raid configurations of the disks are used to provide

Which of the following disk scheduling strategies is likely to give the best throughput?

Formatting for a floppy disk refers to

Which of the following is an example of a spooled device?

A program $P$ reads and processes $1000$ consecutive records from a sequential file $F$ stored on device $D$ without using any file system facilities. Given the following Size of each record $= 3200$ bytes Access time of $D = 10$ msecs Data transfer rate of $D = 800 \times 10^3$ bytes/second CPU time to process each record $= 3$ msecs What is …

The correct matching for the following pairs is: …

Which of the following is an example of spooled device?

The root directory of a disk should be placed