CertiGuide to A+ (A+ 4 Real)

RAID-1¹²² is known as mirroring¹²³ or Duplexing¹²⁴. In a mirrored array, a complete copy of all data is written to both drives simultaneously, as illustrateed in Figure 405. RAID-1 provides full fault tolerance for a single drive failure. There is no significant performance degradation when accessing the remaining drive. The remaining drive operates without any fault tolerance until the failed drive is re-placed and the mirror set is rebuilt.

**Figure 405: Data Mirroring in RAID-1**

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122. http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci214332,00.html

123. http://snipurl.com/DISK_Duplexing

124. http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci796504,00.html

RAID-0

Duplexing

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CertiGuide to A+ (A+ 4 Real) (http://www.CertiGuide.com/apfr/) on CertiGuide.com
Version 1.0 - Version Date: March 29, 2005

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