Raid Groups And Volumes - Fujitsu Eternus DX60 User Manual

Chapter 1 Overview
> 1.2 Configuration
1.2.2

RAID Groups and Volumes

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
Table 1.4
Table 1.4
RAID level
RAID1
RAID1+0
RAID5
RAID5+0
RAID6
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
P3AM-3042-06ENZ0 ETERNUS DX60/DX80/DX90 Disk storage system User Guide
RAID Group 1
Example of a RAID group
show the recommended number of disks that configures a RAID group.
Recommended number of disks per RAID group
Recommended number of disks
2
4, 6, 8, 10
3, 4, 5, 6
6, 8, 10, 12
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.
Volume 1
Volume 2
RAID Group 1
RAID group concept
32
RAID Group 2
Volume 3
RAID Group 2
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