•
LUN Concatenation
Adds areas of free space to an existing volume to expand its capacity. This uses free space from a
RAID group to efficiently expand the volume.
● Expansion of RAID Group Capacity
•
Logical Device Expansion
Adds new drives to an existing RAID group to expand the RAID group capacity. This is used to
expand the existing RAID group capacity instead of adding a new RAID group to add the vol-
umes.
● Migration among RAID Groups
•
RAID Migration
The performance of the current RAID groups may not be satisfactory due to conflicting volumes
after performance requirements have been changed. Use RAID Migration to improve the per-
formance by redistributing the volumes amongst multiple RAID groups.
● Changing the RAID Level
•
RAID Migration (to a RAID group with a different RAID level)
Migrating to a RAID group with a different RAID level changes the RAID level of volumes. This is
used to convert a given volume to a different RAID level.
•
Logical Device Expansion (and changing RAID levels when adding the new drives)
The RAID level for RAID groups can be changed. Adding drives while changing is also available.
This is used to convert the RAID level of all the volumes belonging to a given RAID group.
● Striping for Multiple RAID Groups
•
Wide Striping
Distributing a single volume to multiple RAID groups makes I/O access from the server more effi-
cient and improves the performance.
2. Basic Functions
Optimization of Volume Configurations
56
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems
Design Guide (Basic)
Copyright 2023 Fujitsu Limited
P3AM-7642-32ENZ0
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