Table of Contents
Advertisement
2.5
RAID Configuration
The RAID configuration in the array controller can be used in the combinations shown in
the table below.
Number of logical drives in configuration 1, 3, 5, 10,
Number of logical drives per subsystem
Storage
capacity per
logical drive
* A combination of disk drives of the same capacity and same rotational speed is
required for configuring logical drives.
The RAID levels have the following characteristics.
Level
RAID0
RAID1
RAID5
RAID10 Use of both mirroring
RAID level
When additional 36-GB
disk drive is used
When additional 73-GB
disk drive is used
When additional 147-GB
disk drive is used
Function
Striping
Mirroring
All data is written to two
disk drives.
Striping of data and
redundant data
and striping
RAID0
RAID1
1+1
15
1,024 max.
35.7 to
35.7 GB
536.1 GB
71.6 to
71.6 GB
1074 GB
142.9 to
142.9 GB
2144 GB
Advantage
Highest data read/write rate
Maximum storage capacity
Data recovery enabled
Minimum data recovery time
Data recovery enabled
Larger capacity is available for
users because the capacity of
redundant data is smaller than
that of RAID1.
High-speed data read
Data recovery enabled
High-speed data read/write
13
RAID5
RAID10
2+1 to 14+1 2+2 to 7+7
71.4 to
71.4 to
500.3 GB
250.1 GB
143.2 to
143.2 to
1002 GB
501.2 GB
285.8 to
285.8 to
2001 GB
1000 GB
Disadvantage
Data recovery disabled
(Fault in a single disk
drive causes data to be
lost.)
Low-speed data writing
The storage capacity is
equal to that of disk drive.
Therefore, two disk drives
are required.
Three or more disk drives
are required.
Four or more disk drives
are required.
The required storage
capacity of disk drive is as
twice as the configured
storage capacity.
Advertisement
Table of Contents
