Logical Device Expansion; Figure 30 Logical Device Expansion (When Expanding The Raid Group Capacity); Figure 31 Logical Device Expansion (When Changing The Raid Level) - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
Optimization of Volume Configurations
Refer to "Combinations of Functions That Are Available for Simultaneous Executions" (page 325)
the functions that can be executed simultaneously, the number of simultaneous executions, and the capacity
that can be processed concurrently.
Caution
During RAID Migration, the access performance for the RAID groups that are specified as the RAID
Migration source and RAID Migration destination may be reduced.

Logical Device Expansion

Logical Device Expansion (LDE) allows the capacity of an existing RAID group to be dynamically expanded by
changing of the RAID level or the drive configuration of the RAID group. When this function is performed, drives
can be also added at the same time. By using this LDE function to expand the capacity of an existing RAID
group, a new volume can be added without having to add new RAID groups.
Expand the RAID group capacity (from RAID5(3D+1P) g RAID5(5D+1P))
•
Figure 30 Logical Device Expansion (When Expanding the RAID Group Capacity)
RAID5 (3D+1P) 960GB × 4
Unused 960GB × 2
Change the RAID levels (from RAID5(3D+1P) g RAID1+0(4D+4M))
•
Figure 31 Logical Device Expansion (When Changing the RAID Level)
RAID5 (3D+1P) 960GB × 4
Unused 960GB × 4
LUN0
Expansion
Expands the capacity
by adding two drives
LUN0
Expansion
Expands the capacity by
adding four drives and
changes the RAID level
RAID5 (5D+1P) 960GB × 6
LUN0
RAID1+0 (4D+4M) 960GB × 8
LUN0
LUN0
77
for details on
Design Guide