Drive Installation; Figure 4.9 Drive Combination 1; Figure 4.10 Drive Combination 2 - Fujitsu ETERNUS DX80 S2 Overview

Chapter 4 System Configuration
4.4 Drives
4.4.3

Drive Installation

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 considered.
When a RAID level that performs mirroring (RAID1, RAID1+0) is created, installing drives that are configured
in pairs to different enclosures improves reliability.
RAID1+0 is used in the following examples to explain the drive combinations for RAID levels that configure
mirrored pairs.
The drive number is determined by the DE-ID of the drive 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 drive enclosure

Figure 4.9 Drive combination 1

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

Figure 4.10 Drive combination 2

A
A'
B C D A'
Mirroring
B C D
Mirroring
B' C' D'
ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
Copyright 2013 FUJITSU LIMITED
DE#00
B' C' D'
DE#00
DE#01
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