Toshiba Magnia Z300 User Manual
System Configuration Setup
Configuring MegaRAID IDE
161
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:
RAID level when you create a system drive. The optimal RAID
level for your disk array depends on the following factors:
c
Number of drives in the disk array
c
Capacity of the drives in the array
c
Need for data redundancy
c
Disk performance requirements
The Factors you need to consider when selecting a RAID level are
listed below.
listed below.
Configuring Arrays
After you have attached all physical disk drives, perform the fol-
lowing actions to prepare a RAID disk array:
lowing actions to prepare a RAID disk array:
RAID
Level
Minimum Number of
Physical Drives
Maximum Number of
Physical Drives
0
One
Two
1
Two
Two
Level
Description and Use
Pros
Cons
Max.
Drives
Fault
Tolerant
0
Data divided in blocks
and distributed sequen-
tially (pure striping).
Use for non-critical data
that requires high perfor-
mance.
and distributed sequen-
tially (pure striping).
Use for non-critical data
that requires high perfor-
mance.
High date through-
put for large files.
put for large files.
No fault tolerance.
All data lost if any
drive fails.
All data lost if any
drive fails.
One to
Two
No
1
Data duplicated on
another disk (mirror-
ing). Use for read-inten-
sive fault-tolerant
systems.
another disk (mirror-
ing). Use for read-inten-
sive fault-tolerant
systems.
100 percent data
redundancy.
redundancy.
Doubles disk
space. Reduced
performance dur-
ing rebuilds.
space. Reduced
performance dur-
ing rebuilds.
Two
Yes