Outline for May 13, 2022

Reading: text: , §36–37
Due: Homework 3 and Extra Credit 3, due May 23, 2022; Lab Exercise 2, due June 2

1. Announcements
2. Disk device drivers
   1. VIrtualization of disk sectors
   2. Assumptions for comparing disk scheduling methods
3. Disk access policies
   1. First come, first serve (FCFS)
   2. Pickup
   3. Shortest seek time first (SSF, SSTF)
   4. SCAN
   5. N-Step SCAN
   6. C-SCAN
   7. LOOK, N-Step LOOK, C-LOOK
4. Comparison
5. Optimizations
6. Process interface
   1. open, close
   2. seek, lseek
      1. Disambiguation between successful, unsuccessful lseek
   3. read, write
      1. Scatter-gather
      2. Blocking, nonblocking
   4. control, ioctl

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: mabishop@ucdavis.edu

ECS 150, Operating Systems Version of May 18, 2022 at 12:04AM

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