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Use Cases/Tutorials
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G-RACK 12 RAID Guide
Overview
Traditionally, the mass storage devices are based on mechanical hard drives (HD). Although SSDs
are coming, classical HDs remain the preferred solution for computers ranging from notebook to
servers. HDs provide a huge amount of space at a small cost, though at the same time they are not
very reliable for data storage and backups. Modern world challenges businesses to tailor a solution
with disk fault tolerance and high performance as must-haves.
What is RAID?
RAID stands for “Redundant Array of Independent Disks” and was first used in 1988. RAID technology
was developed to improve data protection and performance, while storing large amounts of data. It
allows to group multiple physical disks into a logical drive and apply one the the existing RAID levels.
Depending on the RAID level selected, performance, redundancy, storage capacity and reliability of
the logical drive will differ. Most levels offer redundancy against drive failure.
Different RAID levels: drawbacks, advantages and tradeoffs
There are several RAID levels or configurations that are defined and standardized upon and also
some of the hybrid RAID configurations.
RAID Level Description Advantage Drawbacks Ideal For
JBOD
Just-a-bunch-of-
disks
Each drive can be ac-
cessed as an individ-
ual volume. Usable
storage capacity is
100% of total avail-
able storage
No fault tolerance Audio applications
RAID 0 Disk striping
Offers the highest
performance and a
100% of total avail-
able storage capacity No fault tolerance
- failure of one drive
in the array results in
complete data loss Content creation ap-
plications requiring
highest performance
and storage capacity