Promise Technology Version 4.4 user manual Striping / Mirroring RAID 0+1

Promise Array Management

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.

Data Stripe

2	1
4	3
6	5
8	7
2	1
4	3
6	5
8	7

Data Mirror

Disk Drives

Figure 85. RAID 0+1 starts with a two-drive Striped array copies it onto two additional drives to make a Mirror

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