1 / 14

RAID

RAID. CS147 Dr. Sin-Min Lee By Kenneth Chen. History. Norman Ken Ouchi at IBM was awarded U.S. Patent 4,092,732 titled "System for recovering data stored in failed memory unit" in 1978

jalila
Download Presentation

RAID

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. RAID CS147 Dr. Sin-Min Lee By Kenneth Chen

  2. History • Norman Ken Ouchi at IBM was awarded U.S. Patent 4,092,732 titled "System for recovering data stored in failed memory unit" in 1978 • In 1987, RAID levels 1 through 5 were formally defined by David A. Patterson, Garth A. Gibson and Randy H. Katz in the paper, "A Case for Redundant Arrays of Inexpensive Disks (RAID)"

  3. About RAID • Early disk drives were costly and bulky • They required strict environmental control • Solution: RAID -- It stands for “Redundant Array of Independent Disks • Idea: Link up a bunch of small, inexpensive disk. Also often referred to as JBOD (just a bunch of disks) • Many different RAID method exists

  4. RAID LEVEL 0 • RAID 0 implements data stripping • Pro: Least cost, very fast on read and write • Con: Not reliable, no-fault tolerance

  5. RAID 1 • RAID 1 implements data mirroring • Pro: Excellent Protection against crashing • Con: Slow on write, costly and inefficient

  6. RAID 2 • RAID 2 implements bit stripping with ECC • Pro: Good performance on both read and write. Good protection. Cheaper than RAID 1 • Con: Hamming code generation is slow, still expensive, no commercial use

  7. RAID 3 • RAID 3 implements bit stripping with parity disk • Pro: Very good performance on read, write. Good protection. Efficient. • Con: Complicated controller design.

  8. RAID 4 • RAID 4 implements data stripping with parity drive. • Pro: fast on read. Good protection • Con: VERY slow write speed. Difficult data rebuild. Complex design. Not used in real life

  9. RAID 5 • RAID 5 implements data stripping with distributed parity • Pro: Fastest read speed, decent write speed. Good protection. Cost effective = commercial success • Con: Most complex design. Difficult to rebuilt data.

  10. RAID 6 • RAID 6 implements data stripping with dual error protection • Pro: Excellent protection, can sustain multiple hits. • Con: Complex to implement.

  11. RAID 10 • RAID 10 = 1 + 0 implements data stripping with mirror drive. • Pro: Excellent protection. Good read and write speed compare to other. • Con: Very expensive.

  12. RAID DP • RAID DP = Double Parity implements data stripping with dual parity disks. • Pro: Excellent protection. Reasonable cost. • Con: Performance not as good as RAID 5.

  13. More on RAID • Textbook page 364-376 • http://www.acnc.com/raid.html • http://en.wikipedia.org/wiki/Redundant_array_of_independent_disks

  14. THANK YOU!!!! And sorry for the boring presentation -_-

More Related