Striping / Mirroring (Raid 0+1) - Promise Technology FastTrak S150 SX4 User Manual

Striping / Mirroring (RAID 0+1)

A combination of RAID 0 and RAID 1 arrays. It can increase performance by
reading and writing data in parallel while protecting data with duplication. A
minimum of four drives are required.
With a four-drive disk array, two pairs of drives are striped. Each pair mirrors the
data on the other pair of striped drives. The data capacity is similar to a standard
Mirroring array with half of total capacity dedicated for redundancy.
Figure 16.
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4
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8
2
4
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8
Disk Drives
RAID 0+1 starts with a two-drive Striped array copies it onto
two additional drives to make a Mirror
Data Stripe
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3
5
7
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3
5
7
45
Chapter 5: Disk Array Concepts
Data
Mirror