Selecting A Raid Level - Acer Altos G300 Series User Manual

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Selecting a RAID Level

To ensure the best performance, you should select the optimal RAID
level when you create a system drive. The optimal RAID level for your
disk array depends on the following factors:
• Number of drives in the disk array
• Capacity of the drives in the array
• Need for data redundancy
• Disk performance requirements
The factors you need to consider when selecting a RAID level are listed
below.
RAID Description
Level and Use
0 Data divided
in blocks
and
distributed
sequentially
(pure
striping).
Use for non-
critical data
that
requires
high
performanc
e.
1 Data
duplicated
on another
disk
(mirroring).
Use for
read-
intensive
fault
tolerant
systems
10 Data divided
in blocks
and
distributed
sequentially
and each
block is
duplicated
to another
disk.
Pros Cons
High data No fault
throughput tolerance. All
for large files. data lost if
any drive
fails.
100 percent Double disk
data space.
redundancy Reduced
performance
during
rebuilds.
100 percent A minimum
data of four drives
redundancy required.
and High data
throughput.
5 Configuring IDE Software RAID
Number of
Drives
One to
Four
Two
Four
Fault
Tolerant
No
Yes
Yes