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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0100:  Hard Drives
      9  IX  RAID

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RAID 1
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JBOD
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RAID 5

This scheme follows the idea of RAID 0 getting different drives to hold different parts of a single file, however a third drive holds what may be best described as a compressed combination of 2 clumps of data from 2 other drives. Obviously this requires a minimum of 3 drives.

RAID 5

RAID 5 needs a minimum of 3 drives.


Using the 9 Gig drives, a grand total of 18 Gigs of data is available just as in RAID 1, and you get to buy a third drive. Such a deal. Well, really it can be because you get two drives that get to send the heads in each drive their own direction. That means faster reads and writes than with the mirror which has to well, mirror.

[spacer]RAID Tricks

You don’t have to devote entire drives to RAID. It is possible to grab only sections of drives. And you cannot create RAID anything unless the drive space devoted is equal across the board. If you have 2 Gigs, 3 Gigs, and 4 Gigs, you have to use 2 Gigs from each drive.


Striping

Regardless of RAID 0 or RAID 5, dividing the data over different physical drives is called striping. The former is without parity the latter is with parity.



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RAID 1
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JBOD
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