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RAID : What is it? Redundant Array of Independent Disks configured into a single logical storage unit.
RAID : Implemented with current disk storage technologies: – SATA Serial Advanced Technology Attachment – SCSI Small Computer System Interface – SSD Solid State Disk
Storage Performance Factors
Storage Performance Factors Capacity Noise Level
Storage Performance Factors Capacity Noise Level Power Consumption
Storage Performance Factors Capacity Noise Level Power Consumption Data Transfer Rate
Storage Performance Factors Capacity Noise Level Power Consumption Data Transfer Rate Reliability
Storage Performance Factors Capacity Noise Level Power Consumption Data Transfer Rate Reliability Temperature
Performance Pyramid Fast Cheap Good S-S, Steady State
Performance Pyramid Fast – Faster IO transfer rate Cheap – Lower cost per GB Good – more reliable, – lower temp, – less noise – Less power consumption
Performance Pyramid FastCheap S-S Good
Technology Comparison Single Unit Storage Devices $/GBMTBFIO RateNoisePower SATA-HDD~$0.05< 90 K-hrs< 100 MB/s~40dB2.5-10W SASCSI-HDD~$1.00~ 90 K-hrs~ 100 MB/s~50dB10W SATA-SSD~$0.50~ 90 K-hrs~ 500 MB/s> 0 dB< 2.5W
RAID Purpose RAID can improve – Reliability (except level-0) – Data Transfer Rates through parallelism (faster than the single unit rates)
RAID Purpose RAID can improve – Reliability – Data Transfer Rates RAID sacrifice – Cost per GB increases
Common RAID Levels RAID-0 RAID-1 RAID-3 RAID-5 RAID-6 RAID-1+0 RAID-0+1
RAID-0 Striped, no mirror, no parity IO Speedup bounded by number of drives and Amdahl’s Law. No fault tolerance Minimum of 2 drives
RAID-1 No Striping, no parity, uses a mirror 2 drives (data and mirror) Fault tolerance is one
RAID-3 Byte level striping and Dedicated parity drive – Parity uses the logical exclusive-or operation n-1 IO speed-up limit Minimum of 3 drives required. Fault tolerance is one
RAID-5 Block level striping Distributed parity Parallel IO data transfer across the array Minimum of 3 drives required Fault tolerance is one
RAID-6 Block level striping Distributed and redundant parity Parallel IO data transfer across the array. Minimum of 4 drives required Fault tolerance is two
RAID-1+0 Combination of RAID-1 and RAID-0 Logical drives are physical pairs configured as RAID-1 devices The logical drives are then configured as a stripe. Fault tolerance is ≥ 1.
RAID-0+1 Combination of RAID-1 and RAID-0 A stripe of drives is mirrored Fault tolerance is ≥ 1.
Relative Reliability of RAID Class exercise
Enhanced Availability With RAID CC5493/7493. RAID Redundant Array of Independent Disks RAID is implemented to improve: –IO throughput (speed) and –Availability.
RAID REDUNDANT ARRAY OF INEXPENSIVE DISKS. Why RAID?
This courseware is copyrighted © 2011 gtslearning. No part of this courseware or any training material supplied by gtslearning International Limited to.
RAID- Redundant Array of Inexpensive Drives. Purpose Provide faster data access and larger storage Provide data redundancy.
Chapter 6 RAID. Chapter 6 — Storage and Other I/O Topics — 2 RAID Redundant Array of Inexpensive (Independent) Disks Use multiple smaller disks (c.f.
Network-Attached Storage. Network-attached storage devices Attached to a local area network, generally an Ethernet-based network environment.
A Case for Redundant Arrays Of Inexpensive Disks Paper By David A Patterson Garth Gibson Randy H Katz University of California Berkeley.
RAID Redundant Array of Inexpensive Disks. History Single Large Expensive Disk (SLED) Single Large Expensive Disk (SLED) IBM and Berkeley University IBM.
RAID Disk Arrays Hank Levy. 212/5/2015 Basic Problems Disks are improving, but much less fast than CPUs We can use multiple disks for improving performance.
RAID Redundant Arrays of Inexpensive Disks –Using lots of disk drives improves: Performance Reliability –Alternative: Specialized, high-performance hardware.
Storage System: RAID Questions answered in this lecture: What is RAID? How does one trade-off between: performance, capacity, and reliability? What is.
This courseware is copyrighted © 2016 gtslearning. No part of this courseware or any training material supplied by gtslearning International Limited to.
CSI-09 COMMUNICATION TECHNOLOGY FAULT TOLERANCE AUTHOR: V.V. SUBRAHMANYAM.
1 Jason Drown Mark Rodden (Redundant Array of Inexpensive Disks) RAID.
Seminar on RAID TECHNOLOGY Redundant Array of Independent Disk By CHANDAN.R 8 TH ISE, 1ap05is013 Under the guidance of Mr.Mithun.B.N, Lecturer,Dept.ISE.
RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks 6 levels in common use Not a hierarchy Set of physical disks viewed as single.
Princess Sumaya Univ. Computer Engineering Dept. Chapter 6:
I/O Errors 1 Computer Organization II © McQuain RAID Redundant Array of Inexpensive (Independent) Disks – Use multiple smaller disks (c.f.
R.A.I.D. Copyright © 2005 by James Hug Redundant Array of Independent (or Inexpensive) Disks.
What is RAID Redundant Array of Independent Disks.
Computer ArchitectureFall 2007 © November 28, 2007 Karem A. Sakallah Lecture 24 Disk IO and RAID CS : Computer Architecture.
I/O Systems and Storage Systems May 22, 2000 Instructor: Gary Kimura.
RAID Oh yes Whats RAID? Redundant Array (of) Independent Disks. A scheme involving multiple disks which replicates data across multiple drives. Methods.
Chap 5: Hard Drives. Chap 5: Magnetic HD Chap 5: Solid State Drives.
Two or more disks Capacity is the same as the total capacity of the drives in the array No fault tolerance-risk of data loss is proportional to the number.
Department of Electronics Advanced Information Storage 18 Atsufumi Hirohata 17:00 05/December/2013 Thursday (P/T 006)
Redundant Array of Independent Disks. Many systems today need to store many terabytes of data. Don’t want to use single, large disk too expensive.
RAID Shuli Han COSC 573 Presentation. What is raid? Redundant Array of Inexpensive Disks: (Independent) is a way of storing the same data in different.
CSE 451: Operating Systems Winter 2010 Module 13 Redundant Arrays of Inexpensive Disks (RAID) and OS structure Mark Zbikowski Gary Kimura.
RAID Technology By: Adarsha A,S 1BY08A03. Overview What is RAID Technology? What is RAID Technology? History of RAID History of RAID Techniques/Methods.
RAID Systems Ver.2.0 Jan 09, 2005 Syam. RAID Primer Redundant Array of Inexpensive Disks random, real-time, redundant, array, assembly, interconnected,
Servers Redundant Array of Inexpensive Disks (RAID) –A group of hard disks is called a disk array FIGURE Server with redundant NICs.
Chapter 6 External Memory Disk and RAID (Redundant Arrays of Independent Disks) CS-147 Fall 2010 Jonathan Wang.
“Redundant Array of Inexpensive Disks”. CONTENTS Storage devices. Optical drives. Floppy disk. Hard disk. Components of Hard disks. RAID technology. Levels.
+ CS 325: CS Hardware and Software Organization and Architecture Memory Organization.
RAID Redundant Array of Independent Disks. 2 Motivation :-)
D-Link International Private Limited Training and Staff Development Department Module : Network Attached Storage Module : Network Attached Storage.
N-Tier Client/Server Architectures Chapter 4 Server - RAID Copyright 2002, Dr. Ken Hoganson All rights reserved. OS Kernel Concept RAID – Redundant Array.
RAID Arrays A short summary for TAFE. What is a RAID A Raid Array is a way of protecting data on a hard drive by using “redundancy” to repeat data across.
RAID TECHNOLOGY. MAGNETIC DISK STORAGE Before we can fully understand RAID, we must first understand the inner workings of a magnetic hard disk, and.
Secondary Storage Unit 013: Systems Architecture Workbook: Secondary Storage 1G.
COMP25212 ARRAY OF DISKS Sergio Davies Feb/Mar 2014COMP25212 – Storage 2.
1 CSC 486/586 Network Storage. 2 Objectives Familiarization with network data storage technologies Understanding of RAID concepts and RAID levels Discuss.
CS 352 : Computer Organization and Design University of Wisconsin-Eau Claire Dan Ernst Storage Systems.
Storage 2: RAID Learning Objectives –To understand the technology drivers leading to RAID arrays –To understand the principles of common RAID configurations.
RAID Tony Rogerson SQL Server MVP Torver Computer Consultants
Hard Drives aka Hard Disk Drives Internal, External, and New Solid State Drives.
1 Magnetic Disks 1956: IBM (RAMAC) first disk drive 5 Mb – Mb/in $/year 9 Kb/sec 1980: SEAGATE first 5.25’’ disk drive 5 Mb – 1.96 Mb/in2 625.
RAID SECTION (2.3.5) ASHLEY BAILEY SEYEDFARAZ YASROBI GOKUL SHANKAR.
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