Fujitsu Eternus DX80 S2 - Figure 5.12 Example of Logical Device Expansion 1; Logical Device Expansion

Chapter 5 Basic Functions
5.3 Optimization of Volume Configurations
ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
Copyright 2013 FUJITSU LIMITED P3AM-4812-11ENZ0
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5.3.2 Logical Device Expansion
Logical Device Expansion (RAID Group Expansion) allows the capacity of an existing RAID group to be
dynamically expanded by the addition of extra drives. By using Logical Device Expansion to expand the
capacity of existing RAID group, a new volume can be added without having to add new RAID groups.
The following examples show Logical Device Expansion:
• RAID5(3+1) configuration converted to a RAID5(4+1) configuration by the addition of an extra drive
Figure 5.12 Example of Logical Device Expansion 1
300GB
Unused
300GB 300GB 300GB 300GB
Volume 0
Volume 1
RAID5(3+1)
300GB 300GB 300GB 300GB 300GB
Volume 0
Volume 1
Volume 2
RAID5(4+1)
Add and define Volume 2
in the free space.