Promise Technology FastTrak SX4000 Lite Uživatelský manuál stáhnout pdf (Strana 51)

Chapter 5: Disk Array Concepts

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.

Disk Drives

Data

Mirro

Data Stripe

Figure 16. RAID 0+1 starts with a two-drive Striped array copies it onto

two additional drives to make a Mirror

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 77 78

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Promise Technology FastTrak SX4000 Lite Uživatelský manuál Strana 51