VTrak E-Class Product Manual - Promise Technology, Inc.

VTrak E-Class Product Manual
RAID 1E – Enhanced Mirror
RAID 1E offers the security of mirrored data provided by RAID 1 plus the added
capacity of more than two disk drives. It also offers overall increased read/write
performance plus the flexibility of using an odd number of disk drives. With RAID
1E, each data stripe is mirrored onto two disk drives. If one drive fails or has
errors, the other drives continue to function, providing fault tolerance.
Enhanced Data Mirrors
Disk Drives
The advantage of RAID 1E is the ability to use an odd number of disk drives,
unlike RAID 1 and RAID 10. You can also create a RAID 1E Logical Drive with an
even number of disk drives. However, if you have an even number of disks, you
will obtain greater security with comparable performance using RAID 10.
RAID 1E arrays consist of three or more physical drives. You can create an array
with just two physical drives and specify RAID 1E. But the resulting array will
actually be a RAID 1.
Recommended applications: Imaging Applications, Database Servers, General
Fileservers.
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