Promise Technology Pegasus32 R6 User Manual

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Promise Technology Pegasus32 R4/R6/R8
Advantages Disadvantages
• Simplest RAID level
• Can increase read performance by
processing data requests in parallel
since the same data resides on two
different drives
• Very high disk overhead – uses only 50% of
total capacity
RecommendedApplicationsforRAID1:
• Accounting
• Payroll
• Financial
• Any application requiring very high availability
RAID 1E – Enhanced Mirror
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exibility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.
RAID 1E can mirror data over an odd number of drives
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 array is actually a RAID 1.
Physical Drives
Enhanced Data Mirrors

Promise Technology Pegasus32 R6 Specifications

General

Brand	Promise Technology
Model	Pegasus32 R6
Category	Storage
Language	English