Logical Device Expansion (Lde) - Fujitsu Eternus2000 Manual

1.3.5

Logical Device Expansion (LDE)

Logical Device Expansion (LDE) allows the capacity of an existing RAID group to be dynamically
extended by the addition of extra disk drives. By using LDE to extend the capacity of existing RAID group
in this way, new volume can be added without having to add new RAID groups, as used to be the case.
The following shows the example when RAID5(3+1) 146GB configuration converted to a RAID5(4+1)
configuration by the addition of an extra disk.
RAID5 (3+1)
146GB
Figure 1.15 Example for use Logical Device Expansion
P3AM-2512-03EN ETERNUS2000 disk storage system User Guide
146GB 146GB 146GB
LUN0 292GB
LUN1 146GB
RAID5 (4+1)
146GB 146GB 146GB
LUN0 292GB
LUN1 146GB
LUN2 146GB
Copyright 2009 FUJITSU LIMITED
Unused
146GB
146GB 146GB
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