Advanced Technology and Systems Co., Ltd.
2
1.2
About RAID levels
The ArrayMasStor J Series supports three RAID levels, so you can choose the optimal level for your
application. The default setting is RAID Level 5 if at least 3 hard disk drives are online. The default
setting is RAID Level 1 if 2 hard disk drives are online. In the following examples, four drives are
assumed to be online.
IMPORTANT !
All stored data will be erased when the RAID level is
changed. Back-up the data before changing the RAID level.
1.2.1
RAID Level 0
In this level, data is striped over all of the drives in the array. This provides the maximum storage
capacity, since the entire array is used solely for data storage, and the ArrayMasStor’s input/output
performance is maximized because of the drives’ parallel processing ability.
IMPORTANT !
In RAID Level 0, there is no data redundancy. Data will be
lost if a drive fails.
The effective storage capacity of this RAID level is as follows:
(Effective storage capacity) = (Capacity of one drive) x (Number of drives)
This RAID level is suitable for applications that require high performance and the largest available
storage capacity, without the need for data protection.
BLOCK 0
BLOCK 1
BLOCK 2
BLOCK 3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
DRIVE 1
DRIVE 2
DRIVE 3
DRIVE 4
0
4
8
°
1
5
9
°
2
6
10
°
3
7
11
°