Lun Concatenation; Figure 5.14 Example Of Lun Concatenation - Fujitsu ETERNUS DX80 S2 Overview

Chapter 5 Basic Functions
5.3 Optimization of Volume Configurations
5.3.3

LUN Concatenation

LUN Concatenation is a function that is used to add new area to a volume for expanding the volume capacity
available to the server. This function enables the reuse of free area in a RAID group and can be used to solve
capacity shortages. The maximum capacity of a volume that is expanded by LUN Concatenation is 128TB.
The following example shows the concatenation of an unused area of a different RAID group into Volume 2 in
order to expand the capacity of Volume 2.

Figure 5.14 Example of LUN Concatenation

RAID5(3+1)
300GB
RAID5(3+1)
300GB
LUN Concatenation cannot be performed when the drive type for the RAID group to which the concatenation
source volume belongs and the drive type to which the concatenation destination volume belongs do not
match.
• When the concatenation source volume is configured with SAS disks or Nearline SAS disks, volumes that
are configured with SAS disks or Nearline SAS disks can be concatenated.
• When the concatenation source volume is configured with SSDs, volumes that are configured with SSDs
can be concatenated.
• When the concatenation source volume is configured with SEDs, volumes that are configured with SEDs
can be concatenated.
300GB 300GB 300GB
Volume 0
Volume 2
300GB 300GB 300GB
Volume 0
Volume 2
ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
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RAID5(3+1)
300GB 300GB 300GB 300GB
Volume 1
Unused area
RAID5(3+1)
300GB 300GB 300GB 300GB
Volume 1
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