Figure 34 Lun Concatenation (Volume Concatenation) - Fujitsu ETERNUS DX100 S4 Design Manual

2. Basic Functions
Optimization of Volume Configurations
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.

Figure 34 LUN Concatenation (Volume Concatenation)

10GB
+
+
20GB
Unused area
Only Standard type volumes can be used for LUN Concatenation. The encryption status of a con-
catenated 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 volume.
For details on the functions that can be executed simultaneously, refer to
tions That Are 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 capacity because expanded volumes may not be recognized by some types and ver-
sions of server-side platforms (OSs).
When a volume that is using ETERNUS SF AdvancedCopy Manager to run backups is expanded
•
via LUN Concatenation, the volume will need to be registered with ETERNUS SF Advanced-
Copy Manager again.
When specifying a volume in the RAID group configured with Advanced Format drives as a
•
concatenation source or a concatenation destination to expand the capacity, the write per-
formance may be reduced when accessing the expanded volumes from an OS or an applica-
tion that does not support Advanced Format.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
Concatenation
30GB
Copyright 2023 Fujitsu Limited
60GB
203).
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