Raid Groups And Volumes - Fujitsu Eternus DX60 User Manual

Chapter 1 Overview
> 1.2 Configuration
Reliability, performance, capacity for each RAID level
Table 1.2
Table 1.2
RAID level
RAID0
RAID1
RAID1+0
RAID5
RAID5+0
RAID6
*1: Performance may differ according to the number of disks and the processing method from the host.
Recommended RAID level
Select the appropriate RAID level according to the usage.
• Recommended RAID level is RAID1, RAID1+0, RAID5, RAID5+0 and RAID6.
• For read and write performance, RAID1+0 configuration is recommended.
• For read only file servers and backup servers, RAID5, RAID5+0, or RAID6 can also be used.
However, if the disk fails, note that it may affect the operation I/O for a rebuilding (writing)
operation.
For details of the rebuilding (writing) operation, refer to
1.2.2

RAID Groups and Volumes

RAID group
In an ETERNUS DX60/DX80 Disk storage system, you can setup the RAID groups to all use the
same RAID level or a mixture of different RAID levels.
Figure 1.7
P3AM-3042-03ENZ0 ETERNUS DX60/DX80 Disk storage system User Guide
shows the comparison result of reliability, performance, capacity for each RAID level.
User Capacity for each RAID Level
Reliability
Bad
Good
Good
Good
Good
Very Good
RAID Group 1
Example of a RAID group
Performance
(Writing speed) (*1)
Very Good
Good
Very Good
Good
Good
Good
"1.3.1 Rebuild/Copyback" (page
28
Capacity
Very Good
Not Bad
Not Bad
Good
Good
Good
RAID Group 2
Copyright 2009 FUJITSU LIMITED
33).