Datasheet

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Figure 3.14: Creating Logical Volumes

3.11.1 Common RAID Levels

RAID 0 This level improves the performance of your data access. Ac-

tually, this is not really a RAID, because it does not provide data

backup, but the name RAID 0 for this type of system has become the

norm. With RAID 0, two hard disks are pooled together. The perfor-

mance is very good — although the RAID system will be destroyed

and your data lost if even one hard disk fails.

RAID 1 This level provides adequate security for your data, as the data is

copied to another hard disk 1:1. This is known as hard disk mirroring.

If a disk is destroyed, a copy of its contents is available on another

one. All of them except one could be damaged without endangering

your data. The writing performance suffers a little in the copying pro-

cess compared to when using RAID 1 (ten to twenty percent slower),

but read access is signiﬁcantly faster in comparison to any one of the

146 3.11. Soft RAID