Figure 35 Lun Concatenation (When The Concatenation Source Is A New Volume); Figure 36 Lun Concatenation (When The Existing Volume Capacity Is Expanded) - Fujitsu ETERNUS AF250 Design Manual

1. Function
Optimization of Volume Configurations
A concatenated volume can be used as an OPC, EC, or QuickOPC copy source or copy destination. It can also be
used as a SnapOPC/SnapOPC+ copy source.
The LUN number stays the same before and after the concatenation. Because the server-side LUNs are not
changed, an OS reboot is not required. Data can be accessed from the host in the same way regardless of the
concatenation status (before, during, or after concatenation). However, the recognition methods of the volume
capacity expansion vary depending on the OS types.
When the concatenation source is a new volume
•
A new volume can be created by selecting a RAID group with unused capacity.

Figure 35 LUN Concatenation (When the Concatenation Source Is a New Volume)

+
10GB
• When expanding capacity of an existing volume
A volume can be created by concatenating an existing volume into unused capacity.

Figure 36 LUN Concatenation (When the Existing Volume Capacity Is Expanded)

10GB
+
20GB
Unused area
Only Standard type volumes can be used for LUN Concatenation. The encryption status of a concatenated volume
is the same status as a volume that is to be concatenated.
LUN Concatenation may not be available when other functions are being used in the device or the target vol-
ume.
For details on the functions that can be executed simultaneously, refer to
Available for Simultaneous Executions" (page
It is recommended that the data on the volumes that are to be concatenated be backed up first.
•
Refer to the applicable OS and file system documentation before dynamically expanding the volume ca-
•
pacity because expanded volumes may not be recognized by some types and versions of server-side plat-
forms (OSs).
When a volume that is using ETERNUS SF AdvancedCopy Manager to run backups is expanded via LUN Con-
•
catenation, the volume will need to be registered with ETERNUS SF AdvancedCopy Manager again.
+
20GB 30GB
Unused area
Concatenation
+
30GB
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
Concatenation
60GB
167).
63
60GB
"Combinations of Functions That Are
P3AG-1822-09ENZ0