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Published byRandolph Richardson
Modified over 2 years ago
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
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.
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