PPT-I/O Systems (2): Disks 1

CSE 2431 Introduction to Operating Systems Instructor Adam C Champion PhD Reading Chap 11 135 1456 OSC Outline Disk Organization Disk Performance Disk Scheduling Algorithms. All Fujifilm floppy disk manufacturing plants worldwide have been awarded ISO9002 certification your assurance of stringent quality control at every step of the production process And Fujifilm floppy disks have been successfully tested beyond 30 mil Protoplanetary. Disks. Colette Salyk. National Optical Astronomy Observatory. Credit: JPL-Caltech/T. Pyle (SSC). Credit: NASA. ?. Why studying . protoplanetary. . disks is important for understanding habitability. Kesseli. , . Arjen. van der . Wel. , Eric Bell, Guillermo . Barro. . and the CANDELS Collaboration. Quiescent Disks in the Early Universe. Red sequence in place at z~2. Growth in quiescent population (red symbols) is dramatic since z~2. RAID (Redundant Arrays of Independent Disks). Disk . organization technique that manages a large number of disks, providing a view of a single disk of. High capacity and high speed up using multiple disk in parallel. Prince Sultan College For Woman. Dept. of Computer & Information Sciences. CS 251. Introduction to Computer Organization . & Assembly Language. Lecture 8. (Computer System Organization). Secondary Memory. to Achieve . Temporal Coverage of Objects and . Its Surveillance . Application. You-. Chiun. Wang, Yung-Fu Chen, and Yu-. Chee. Tseng. IEEE TRANSACTIONS ON MOBILE . COMPUTING 2011. Outline. . Introduction. for the United States Department of Energy’s National Nuclear Security Administration. under contract DE-AC04-94AL85000.. Eurographics 2013. Sifted Disks. reducing the number of sample points . retaining randomness . a. nd stellar multiplicity. Insights from recent surveys. Gaspard . Duchêne. (UC Berkeley, Obs. Grenoble). © NASA/JPL/Caltech. Planets in multiple systems?. © . LucasFilm. Ltd.. They must exist!. Ofir Weisse. EECS 582 – W16. 1. About the paper. Published in 1988. Summarized existing technologies. EECS 582 – W16. 2. Motivation – What’s In the Box? . (That we call a computer). EECS 582 – W16. Web Content Distribution-. --3. Case Study: Facebook f4. Steve Ko. Computer Sciences and Engineering. University at Buffalo. Recap. Engineering principle. Make the common case fast, and rare cases correct. (DRAM). Local secondary storage. (local disks). Larger, . slower, . and . cheaper . (per byte). storage. devices. Remote secondary storage. (distributed file systems, Web servers). Local disks hold files retrieved from disks on remote network servers.. Insights from recent surveys. Gaspard . Duchêne. (UC Berkeley, Obs. Grenoble). © NASA/JPL/Caltech. Planets in multiple systems?. © . LucasFilm. Ltd.. They must exist!. Planets in multiple systems!. Reads and writes are equally fast.. Arrays of these disks are used to provide highly reliable storage.. Increasingly popular as they are fast and do not contain moving parts.. Magnetic Disks.. . What is a magnetic disk and how it works. Don Porter. Portions courtesy Emmett . Witchel. 1. Quick Recap. CPU Scheduling. Balance competing concerns with heuristics. What were some goals?. No perfect solution. Today: Block device scheduling.