Lun Concatenation - Fujitsu ETERNUS DX60 S2 User Manual

Chapter 3 Setup
3.3 Optimizing Volume Configurations
• LDE can be performed if the new RAID group capacity is the same or larger than the old
capacity.
• When adding disks, use a disk with a capacity that is the same or with a larger capacity than
the disks in the RAID groups that are targets for LDE. After LDE completes, all the disks in the
target RAID groups are recognized as having the same capacity as the disk with the smallest
capacity in the RAID group. The rest of the capacity in the disks that have a larger capacity
cannot be used.
• LDE can be performed on a RAID group that contains an Advanced Copy target (copy source
or copy destination) volume.
• Capacity expansion and changing the level of a RAID group can be performed at the same
time.
• Since the data cannot be recovered after the failure of LDE, back up all the data of the
volumes in the target RAID group to another area before performing LDE. If LDE fails, recover
using this backup data.
• Volumes cannot be added to the target RAID groups while LDE is running. Volumes can be
added after LDE is complete. Volumes cannot be deleted from the target RAID groups while
LDE is running.
• If the power is turned off or an electrical power outage occurs during LDE, the process will
simply continue when the power is restored.
3.3.3

LUN Concatenation

LUN Concatenation is a function that is used to add new area to a volume for expanding the vol-
ume capacity available to the server. The ability to concatenate widely distributed free areas in
the ETERNUS DX Disk storage system allows efficient use of the disk capacity.
Unused areas, which may be either part or all of a RAID group, are used to create new volumes
that are then added together (concatenated) to form a single large volume.
This section describes the restrictions and notes on using LUN Concatenation.
For details on the LUN Concatenation procedure, refer to "ETERNUS Web GUI User's Guide" or
"ETERNUS CLI User's Guide".
• Volumes can be specified as a target for LUN Concatenation.
• Multiple volumes can be concatenated. Up to 16 volumes can be concatenated.
• Maximum concatenated volume capacity is 32TB.
• The minimum required capacity of each volume being concatenated is 1GB.
• Conditions for volumes to be concatenated are as follows:
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• LUN Concatenation cannot be performed under the following conditions:
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ETERNUS DX60 S2 Disk storage system User's Guide -Operation-
Only "Open" type volumes can be used for LUN Concatenation. SDV cannot be
concatenated. The encryption status of a concatenated volume is the same status as a
volume that is to be concatenated.
The RAID levels may be any that are supported by the ETERNUS DX Disk storage system
with no need for all to be the same or any other limitation. It is also possible to connect up
volumes with different RAID levels. Volumes in RAID groups with different types (such as
capacity or speed) of disks can be concatenated. However, RAID groups with the same
RAID level and same disk type are recommended for concatenated volumes to ensure
that performance is not affected.
When the volume to be concatenated contains an Advanced Copy session.
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