Arrays With No Redundancy: Raid Level 0 - HP P3410A - NetRAID 1M RAID Controller Installation And Configuration Manual

Chapter 2
Spanned arrays have logical drives that are spread across multiple arrays
(as many as eight). This permits the physical drives in up to eight arrays
to function as one large logical drive. Each spanned array must contain
the same number of disks and all the disks in the logical drive must be
connected to the same NetRAID adapter. Spanned array configurations
use RAID levels 10 and 50.

Arrays with No Redundancy: RAID Level 0

RAID 0: Striping
In RAID 0 configurations, data is distributed among hard disks in the array via
an algorithm called striping. Data written to a logical drive is divided into pieces
called blocks. RAID 0 provides no data redundancy. If one hard disk fails, the
data is lost from the entire logical drive and must be retrieved from a backup
copy. If you have five physical drives configured as one RAID 0 logical drive,
data blocks are written as follows:
Disk 1
Stripe 1 Block 1
Stripe 2 Block 6
The RAID 0 algorithm allows data to be accessed on multiple disks
simultaneously. Read and write performance on a multidisk RAID 0 system is
significantly faster than on a single drive system.
RAID 0 Advantages
Provides maximum data capacity, because all disk space is used for data.
Costs are low, because no disk space is allocated for redundancy.
Access time is fast for both reads and writes.
RAID 0 Disadvantages
RAID 0 provides no redundancy so if a hard drive fails, data must be
restored from backup.
Hot spares cannot be used with RAID 0 configurations.
RAID 0 Summary
Choose RAID 0 if redundancy is not required, and you need fast
performance and low costs.
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Disk 2 Disk 3
Block 2 Block 3
Block 7 Block 8
RAID Overview
Disk 4 Disk 5
Block 4 Block 5
Block 9 Block 10