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The RAID 0 array does not backup data, so it is not regarded as a real RAID application. If one of the
hard disks is damaged, the entire array will fail, and all data in the array will be lost. Therefore, the fault
tolerance of RAID 0 is lower than that of any hard disk in the array. However, RAID 0 is still the term
widely used to describe these arrays. It is because that its basic idea is similar to real RAID application.
Mirroring (High security; at least 2 hard disks required)
In the RAID 1 array (commonly referred to as mirroring array), hard disks are paired up; each of the two
disks contains identical data. As data is written into the mirroring array, it will be written at once and read
simultaneously. Mirroring array is highly reliable. Because it will not fail until the paired hard disks fail at
the same time. For instance, in a mirroring array of five-pair hard disks, even as many as five hard disks
fail, the array still can maintain the data integrity --as long as each pair has one good hard disk left.
Below is the comparison between 2 RAID levels:
RAID Level
Basic Operation
Method
Hard Disk
Available
Capacity
Data Reliability
Data Transfer
Speed
Minimum
Number of Hard
Disks
0
Striping data
across each
drive
Total capacity
of all the hard
disks
Low Highest 2
1 Mirroring
Half of total
capacity of all
the hard disks
High Lower 2
For more information of RAID, refer to our website at www.PATRIOTMEMORY.com
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RAID Introduction