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RAID 1

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RAID 1
(Redundant Array of Independent Disks Mode 1) A popular disk subsystem that increases safety by writing the same data on two drives. Called "mirroring," RAID 1 does not increase performance. However, if one drive fails, the second drive is used, and the failed drive is manually replaced. After replacement, the RAID controller duplicates the contents of the working drive onto the new one. See RAID 10 and RAID.



Mirroring for Fault Tolerance Widely used, mirroring writes two drives at the same time so that data are duplicated. It provides the highest reliability, but doubles the number of drives needed.
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In the same way that RAID 0 focuses solely on storage capacity and performance with no concern whatsoever on reliable data storage RAID 1, which us also called "Disk Mirroring" uses disks in pairs to save the files in a redundant manner.
An Introduction to Raid ? Greater Reliability ,Faster, Less Costly ... by Franklin R. West / Computers and Internet community
Another type of RAID configuration, and one more germane to most readers, is RAID 1 configuration, often called "mirroring.
The 411 on raid: when two is always better than one by Needleman, Ted / The Non-profit Times
In addition to providing better overall protection when connecting more hard disks, RAID 6 solutions with multiple parity can resolve the perennial problem unavoidable with traditional single parity array configurations (such as RAID 1, 5 and 10).
Improving data availability with RAID 6 by Chien, Hammer / Computer Technology Review
 
 
 
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