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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.

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Presentation on theme: "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."— 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 = 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 ay_of_independent_disks

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


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