Summary Comparison of RAID Levels.

Udgivet d. 16 Nov. 2001 af: Bo Krüger Hansen

Below you will find a table that summarizes the key quantitative attributes of the various RAID levels for easy comparison. For the full details on any RAID level, see its own page, accessible here. For a description of the different characteristics, see the discussion of factors differentiating RAID levels. Also be sure to read the notes that follow the table:

RAID Level

Number of Disks

Capacity

Storage Efficiency

Fault Tolerance

Availability

Random Read Perf

Random Write Perf

Sequential Read Perf

Sequential
Write Perf

Cost

0

2,3,4,... S*N 100% none 1.0 stars 4.0 stars 4.0 stars 4.5 stars 4.0 stars $

1

2 S*N/2 50% 4.0 stars 4.0 stars 3.0 stars 3.0 stars 2.0 stars 3.0 stars $$

2

many varies, large ~ 70-80% 2.0 stars 4.0 stars 2.0 stars 1.0 stars 4.0 stars 2.5 stars $$$$$

3

3,4,5,... S*(N-1) (N-1)/N 3.0 stars 4.0 stars 3.0 stars 1.0 stars 4.0 stars 2.5 stars $$

4

3,4,5,... S*(N-1) (N-1)/N 3.0 stars 4.0 stars 4.0 stars 1.5 stars 3.0 stars 2.0 stars $$

5

3,4,5,... S*(N-1) (N-1)/N 3.0 stars 4.0 stars 4.5 stars 2.0 stars 3.5 stars 2.5 stars $$

6

4,5,6,... S*(N-2) (N-2)/N 4.5 stars 5.0 stars 4.5 stars 1.0 stars 3.5 stars 2.0 stars $$$

7

varies varies varies 3.0 stars 4.0 stars 4.5 stars 4.0 stars 4.5 stars 4.0 stars $$$$$

01/10

4,6,8,... S*N/2 50% 4.0 stars 4.5 stars 4.5 stars 3.5 stars 4.5 stars 3.5 stars $$$

03/30

6,8,9,10,... S*N0*(N3-1) (N3-1)/N3 3.5 stars 4.0 stars 4.0 stars 2.0 stars 4.5 stars 3.0 stars $$$$

05/50

6,8,9,10,... S*N0*(N5-1) (N5-1)/N5 3.5 stars 4.0 stars 4.5 stars 3.0 stars 4.0 stars 3.0 stars $$$$

15/51

6,8,10,... S*((N/2)-1) ((N/2)-1)/N 5.0 stars 5.0 stars 4.0 stars 3.0 stars 4.0 stars 3.0 stars $$$$$

Notes on the table:

Back to RAID main page.





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