Recommended Raid Group Configurations; Figure 119 Drive Combination 1; Figure 120 Drive Combination 2 - Fujitsu ETERNUS DX100 S4 Design Manual

5. Hardware Configurations

Recommended RAID Group Configurations

Recommended RAID Group Configurations
No restrictions on the installation location of drives apply if the same types of drives are used to
create RAID groups.
To improve reliability, the installation location of drives that configure a RAID group must be con-
sidered.
Data reliability when enclosures fail can be improved by selecting configuration drives that are dis-
tributed to a larger number of enclosures when a RAID group is created.
For details on the recommended number of drives that configure a RAID group, refer to
Group" (page 24).
■
Mirroring Configuration
RAID1+0(4D+4M) is used in the following examples to explain how drives are installed to configure
a mirroring RAID level.
The drive number is determined by the DE-ID of the enclosure and the slot number in which the
drive is installed. Starting from the smallest drive number in the configuration, half of the drives are
allocated into one group and the remaining drives are allocated into the other group. Each drive in
the different groups are paired for mirroring.
Example 1: All drives are installed in a single enclosure

Figure 119 Drive Combination 1

A B
Example 2: Paired drives are installed in two different enclosures

Figure 120 Drive Combination 2

A B
A' B'
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
DE#00
C D A' B'
Mirroring
DE#00
C D
Mirroring
DE#01
C' D'
192
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C' D'
"RAID
P3AM-7642-32ENZ0