Chapter 1 Overview
1.2 Configuration
ETERNUS DX60/DX80/DX90 Disk storage system User Guide
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Copyright 2011 FUJITSU LIMITED
P3AM-3042-08ENZ0
1.2.2
RAID Groups and Volumes
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RAID group
In an ETERNUS DX60/DX80/DX90 Disk storage system, you can set up the RAID groups to all
use the same RAID level or a mixture of different RAID levels.
Figure 1.7
Example of a RAID group
show the recommended number of disks that configures a RAID group.
Table 1.4
Recommended number of disks per RAID group
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Volume
Logical disk areas in RAID groups are called volumes.
A volume is the basic RAID unit, that can be recognized by the server.
Figure 1.8
RAID group concept
RAID level
Recommended number of disks
RAID1
2
RAID1+0
4, 6, 8, 10
RAID5
3, 4, 5, 6
RAID5+0
6, 8, 10, 12
RAID6
5, 6, 7
•
Adding more disks to a RAID group improves performance.
•
Use of higher capacity disks in a RAID group will increase the time
required for the disk rebuild process to complete.
•
The more disks per RAID5, RAID5+0, or RAID6 group, the longer the
period of time for data restoration from parities and rebuilding process.
RAID Group 1
RAID Group 2
RAID Group 1
RAID Group 2
Volume 1
Volume 2
Volume 3