Logical Device Expansion; Figure 26 Logical Device Expansion (When Expanding The Raid Group Capacity) - Fujitsu ETERNUS DX60 S4 Design Manual

1. Function
Optimization of Volume Configurations
The following processes can also be specified.
Capacity expansion
•
When migration between RAID groups is performed, capacity expansion can also be performed at the same
time. However, the capacity cannot be expanded for TPVs.
TPV capacity optimization
•
When the migration destination is a pool (TPP), TPV capacity optimization after the migration can be set.
For details on the features of the TPV capacity optimization, refer to
Specify unused areas in the migration destination (RAID group or pool) with a capacity larger than the migration
source volume.
RAID migration may not be available when other functions are being used in the ETERNUS DX or the target vol-
ume.
Refer to "Combinations of Functions That Are Available for Simultaneous Executions" (page 146)
the functions that can be executed simultaneously, the number of the process that can be processed simultane-
ously, and the capacity that can be processed concurrently.
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 26 Logical Device Expansion (When Expanding the RAID Group Capacity)

RAID5 (3D+1P) 600GB x 4
Unused 600GB x 2
FUJITSU Storage ETERNUS DX60 S4, ETERNUS DX60 S3 Hybrid Storage Systems Design Guide (Basic)
LUN0
Expansion
Expands the capacity
by adding two drives
Copyright 2019 FUJITSU LIMITED
"TPV Capacity Optimization" (page
RAID5 (5D+1P) 600GB x 6
LUN0
45
41).
for details on
P3AM-8992-14ENZ0