Striping / Mirroring (Raid 0+1) - Promise Technology FastTrak SX Series Version 4.4 User Manual

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.
Figure 85. RAID 0+1 starts with a two-drive Striped array copies it onto
two additional drives to make a Mirror
Data Stripe
2
4
6
8
2
4
6
8
Disk Drives
1
3
5
7
1
3
5
7
86
Data
Mirror