Understanding Raid Levels - HP D5970A - NetServer - LCII Configuration Manual

Chapter 2
The nine physical drives are in three arrays (A0, A1, and A2)
with one global hot spare.
Figure 2-3. Sample Configuration with Three Arrays and

Understanding RAID Levels

During installation, you configure your logical drives by running a disk array
configuration utility. Each of the logical drives you define must have an assigned
RAID level. Each RAID level has different advantages in terms of performance,
redundancy, and capacity. The integrated HP NetRAID controller supports both
non-spanned array and spanned array configurations.
Non-spanned arrays have logical drives that are contained entirely within
the array. Non-spanned array configurations use RAID levels 0, 1, 3, or 5.
Spanned arrays have logical drives that are spread across multiple arrays.
This permits the physical drives on two, three, or four arrays to function
as one large logical drive. Spanned array configurations use RAID levels
10, 30, and 50.
Three Logical Drives
RAID Overview
9