PPT-Disks

and RAID Outline Disks Disk scheduling algorithms Redundancy in storage systems RAID 2 Disk Geometry Disks have multiple platters Each platter has an arm and a head for accessing data The arms for the different platters move together. Lecturer: . Ofer. Rothschild. 1. Problem with the borders. 2. Meshes without borders. Given a set of points in [1/4, 3/4]X[1/4, 3/4]. With diameter > ½. The points are vertices in the triangulation. 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. Hai. Lu. RAID. RAID. , an acronym for . redundant array of independent disks. or also known as . redundant array of inexpensive disks. , is a technology that allows high levels of storage reliability from low-cost and less reliable PC-class disk-drive components, via the technique of arranging the devices into arrays for redundancy.. 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. Power law. Haystack. A design for warm photos. 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. ASHIMA KALRA . . Hard disks.. . Floppy disks.. . CD ROMs.. . DVDs.. . INDEX. ….. Floppy Disks. The first floppy disks were 8 Inches in diameter.They hold upto 256 KB.. The next generation were 5.25 inches in diameter.It Could hold up to 1.44 MB.It is a standard one.. 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. Ms. . Albu. E. Block. Results . -. The effect of leaf type on rate of leaf disk floats (Spinach vs. Asian Pear). Hypothesis: If oxygen is removed from the discs of spinach leaves and asian pear leaves, then the spinach discs will photosynthesize at a faster rate than the asian pear discs will.. . 6. /27/12. In collaboration with . Avi. Loeb. Harvard University Astronomy Department. arXiv:. 1109.6660, PRL 108, 6, 061302. Observing . Lense-Thirring. Precession in Tidal Disruption Flares. Outline. Pawel. . Artymowicz. U of Toronto. MRI turbulence. Some non-MRI turbulence. Roles and the dangers of turbulence. UCSC Santa Cruz 2010. I borrowed some . figures & slides from. X. Wu (2004). R. Nelson (2008). (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.. Two main types: Magnetic and Optical. Random access to memory. The hardware must be controlled by driver software called the “controller” in order to be used. Hard Disks, RAID, and Error Handling. CSE 2431: Introduction to Operating Systems. Instructor: Adam C. Champion, Ph.D.. Reading: Chap. 11. , §§13.5, 14.5.6 . [OSC]. Outline. Disk Organization. Disk Performance. Disk Scheduling Algorithms.