Promise Technology EX8650A User Manual
Chapter 6: Technology Background
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RAID 10 – Mirror / Stripe
Mirror/Stripe combines both of the RAID 0 and RAID 1 logical drive types. RAID
10 is similar though not identical to RAID 0+1. It can increase performance by
reading and writing data in parallel while protecting data with duplication. The
data on one drive pair is mirrored together, then striped over a second drive pair.
10 is similar though not identical to RAID 0+1. It can increase performance by
reading and writing data in parallel while protecting data with duplication. The
data on one drive pair is mirrored together, then striped over a second drive pair.
Figure 6. RAID 10 takes a data mirror on one drive pair and stripes it over a
second drive pair
second drive pair
The data capacity RAID 10 logical drive equals the capacity of the smallest
physical drive times the number of physical drives, divided by two.
physical drive times the number of physical drives, divided by two.
In some cases, RAID 10 offers double fault tolerance, depending on which
physical drives fail.
physical drives fail.
RAID 10 arrays require an even number of physical drives and a minimum of
four.
four.
For RAID 10 characteristics with an odd number of physical drives, use RAID 1E.
Data Stripe
Data
Mirror
Physical Drives