Raid Groups And Volumes - Fujitsu Eternus2000 Manual

1.2 Configuration
Reliability, performance, capacity for each RAID level
Table 1.2
Table 1.2
RAID0
RAID1
RAID1+0
RAID5
RAID6
Recommended RAID level
Select the appropriate RAID level according to the usage.
• Recommended RAID level is RAID1, RAID1+0, RAID5 and RAID6.
• For read and write performance, RAID1+0 configuration is recommended.
• For read only file servers and backup servers, RAID5 or RAID6 can also be used. How-
1.2.2

RAID Groups and Volumes

RAID group
In an ETERNUS2000 disk storage system, you can setup the RAID groups to all use the same RAID level
or a mixture of different RAID levels.
Figure 1.6
8
shows the comparison result of reliability, performance, capacity for each RAID level.
User Capacity for each RAID Level
RAID level Reliability
Very Good
Very Good
Very Good
ever, if the disk drive fails, note that it may affect the operation I/O for a rebuilding (writing)
operation.
RAID Group 1
Example of a RAID group
Copyright 2009 FUJITSU LIMITED
Performance
(Writing speed)
Bad Good
Good
Good
Good Not Bad
Not Bad
ETERNUS2000 disk storage system User Guide
Capacity
Very Good
Not Bad
Not Bad
Good
Good
RAID Group 2
P3AM-2512-03EN