[2021] PSU - CMPSC 473 Operating Systems - Final Exam - Q5 Disk Read Seek Time
Q5
Consider the toy file system covered in Lecture 28. Assume the filesystem has already been mounted and has its super-block already in DRAM. Assume all subsequent filesystem-related in-memory caching and buffering are disabled. Assume a process opens a new file /usr/name/file.txt and is assigned the file descriptor fd. Assume exactly the same file system layout style as considered in Lecture 28. Assume that the sectors comprising a filesystem block reside on the same track. Assume the i-node bitmap, data bitmap, i-node blocks, and data blocks reside on mutually separate sets of tracks (no tracks shared among any of these). Calculate the number of disk seeks caused by the above opening of the file.
o 12
o 15
o 8
o 10
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