Figure 36 Lun Concatenation (When The Concatenation Source Is A New Volume); Figure 37 Lun Concatenation (When The Existing Volume Capacity Is Expanded) - Fujitsu ETERNUS DX500 S4/DX600 S4 Design Manual

2. Basic Functions
Optimization of Volume Configurations
Concatenation can be performed regardless of the RAID types of the concatenation source volume and the con-
catenation destination volume.
When there are concatenation source volumes in SAS disks or Nearline SAS disks, concatenation can be per-
formed with volumes in SAS disks or Nearline SAS disks.
For SSDs and SEDs, the drives for the concatenation source and destination volumes must be the same type (SSD
or SED).
From a performance perspective, using RAID groups with the same RAID level and the same drives (type, size,
capacity, and rotational speed (for disks), interface speed (for SSDs), and drive enclosure transfer speed (for
SSDs)) is recommended as the concatenation source.
The same key group setting is recommended for the RAID group to which the concatenation source volumes be-
long and the RAID group to which the concatenation destination volumes belong if the RAID groups are config-
ured with SEDs.
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 36 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 37 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
FUJITSU Storage ETERNUS DX500 S4/DX600 S4, ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems Design Guide (Basic)
+
20GB 30GB
Unused area
Concatenation
+
30GB
Copyright 2019 FUJITSU LIMITED
Concatenation
60GB
214).
63
60GB
"Combinations of Functions That Are
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