Promise Technology 2-Year Extended Warranty for VessR2000 RAID Head - Manual (Page 583)

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Vess R2000 Series Product Manual Promise Technologies
RAID 1e – e
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RAID 1E offers the security of mirrored data provided by RAID 1 plus the added capacity of more than two
physical drives. It also offers overall increased read/write performance plus the flexibility of using an odd number
of physical drives. With RAID 1E, each data stripe is mirrored onto two physical drives. If one drive fails or has
errors, the other drives continue to function, providing fault tolerance.
The advantage of RAID 1E is the ability to use an odd number of physical drives, unlike RAID 1 and RAID 10.
You can also create a RAID 1E Logical Drive with an even number of physical drives. However, with an even
number of drives, you obtain somewhat greater security with comparable performance using RAID 10.
RAID 1E logical drives consist of three or more physical drives. You can create an array with just two physical
drives and specify RAID 1E. But the resulting ar-ray is actually a RAID 1.
RAID 1E can mirror data over an odd number of drives
Physical Drives
Enhanced Date Mirrors