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An Overview of RAID

An Overview of RAID. Chris Erickson Graduate Student Department of Electrical and Computer Engineering Auburn University, Auburn, AL 36849 Chris.Erickson@auburn.edu. Objectives. Raid definition Why RAID technology was invented RAID structure Current RAID applications. What is RAID?.

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An Overview of RAID

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  1. An Overview of RAID Chris Erickson Graduate Student Department of Electrical and Computer Engineering Auburn University, Auburn, AL 36849 Chris.Erickson@auburn.edu

  2. Objectives • Raid definition • Why RAID technology was invented • RAID structure • Current RAID applications

  3. What is RAID? • Redundant • Array • Inexpensive / Independent • Disks

  4. How does is work? • Requires 2 or more hard drives • Requires either hardware or software controller logic • Allows disk drive storage to increase speed, reliability, or both at a minimal overhead cost

  5. Why RAID? • Industries and companies require massive amounts of data to be securely stored. • Tape storage is still prevalent for long term, archival storage but not effective for random access. • Hard Disk Drives are perfect for random access in the Giga, Tera, Petabyte range.

  6. More RAID background • Hard Disk Drives have a mean-time-to-error • With the possibility of error, regardless of how small, something had to be done. • Hard Disk Drives have a latency involved with seeking. • For a PC the latency is almost negligible. When thousands of people are trying to access the same location, something had to be done

  7. RAID 0 • Striped • Delivers very high performance • Requires 2 or more disk drives Data

  8. RAID 1 • Mirroring • Delivers the exact same data to 2 disks. Used for max redundancy and reliability. Data

  9. RAID 5 • Stripe & Parity • Provides the speed of striping and provides the parity for redundancy Data

  10. RAID 10 • Provides dual RAID 1 configurations with RAID 0 mirroring • Delivers the exact same data to 2 disks. Used for max redundancy and reliability. RAID 0 RAID 1 RAID 1

  11. RAID • The more drives the better the benefits • RAID 5 is most popular for home & small office users. It provides the most inexpensive solution to have speed and reasonable reliability • RAID 10 – Used by large corporations for maximum redundancy and reasonable speed

  12. Completed !! • Any Question? Comments?

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