PPT-RAID Redundant Array of Inexpensive (Independent) Disks

Use multiple smaller disks cf one large disk Parallelism improves performance Plus extra disks for redundant data storage Provides fault tolerant storage system Especially if failed disks can be hot swapped. The first implementations of RAID in 1990 were very expensive controller boards with high rmance IO processors that were as powerful as the host CPU At that time when hardwarebased RAID solutions were the only option the cost of a RAID controller li P ATTERSON G ARTH IBSON AND ANDY H K ATZ Computer Science Division Department of Electrical Engineering and Computer Sciences 571 Evans Hall University of California Berkeley CA 94720 Abstract Increasing performance of CPUs and memories will be squa Redundant Array of Inexpensive Discs. What is RAID Arrays?. RAID is an acronym for Redundant Array of Independent Drives (or Disks), also known as Redundant Array of Inexpensive Drives (or Disks). The various types of RAID are data storage schemes that divide and/or replicate data among multiple hard drives. RAID. What is RAID. ?. RAID is an acronym for Redundant Array of Independent Drives (or Disks), also known as Redundant Array of Inexpensive Drives (or Disks). The various types of RAID are data storage schemes that divide and/or replicate data among multiple hard drives. 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.. 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. Lecture 39: IO Disks. Instructor: Dan Garcia. http://inst.eecs.Berkeley.edu/~cs61c/. 1. Technology in the News. www.cnn.com/2014/04/28/tech/innovation/google-self-driving-car/. 2. Review. . Exceptions are “Unexpected” events. Denny Cherry. mrdenny@mrdenny.com. twitter.com/. mrdenny. About Me. Author or Coauthor of 4 books. 6+ SQL Mag articles. Dozens of other articles. Microsoft MVP since Oct 2008. Microsoft Certified Master. 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. 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. David A Patterson, Garth Gibson, and Randy H Katz. Presented by Connor Bolton. Background. 1974 to 1984 – Single chip speed increased 40% a year . Magnetic disk doubled capacity and halved in price every 3 years. 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. Chapter 8 Adding Disks Loops Run instructions again, and again, and again…. Check some condition If true, repeat 2 types of loops for loop while loop First, the variable used in loop condition must be initialized, then execution of the loop begins. media. PM Video 10:28. Selecting a Hard Drive. Some considerations when selecting a hard drive:. Drive capacity. Today’s hard drives range from 60 GB – 10 TB. Spindle speed (measured in RPM). Common spindle speeds are: 3600, 5400, 7200, 10,000, and 15,000 RPM.