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Chapter 5 Configuration Menu
> 5.2 RAID Management
ETERNUS DX400/DX8000 series ETERNUSmgr User Guide Settings/Maintenance
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5.2.12 RAID Migration
This function migrates a volume in a RAID Group or Thin Provisioning Pool (TPP) to free space
in another RAID Group or TPP.
The [RAID Migration] function enables load-balancing of host access as well as RAID level con-
version by moving volumes. When the migration source and destination are Open Volumes, the
capacity can be expanded by setting the volume capacity of the destination using RAID Migra
-
tion.
This function has an automatic function that creates a new Logical Volume, formats, and estab-
lishes a host interface. Because data in the volume will be moved to the new volume, users are
allowed to access the data anytime without being affected by the migration. After RAID Migration
has completed, the migration source volume will be deleted.
■ Migration Type
The combinations for volume types that can be migrated (migration source volume → migration
destination volume) are as follows.
• Open → Open
• Open → TPV (*1)
• TPV → Open (*2)
• TPV → TPV
*1: For [Open] to [TPV] migration, 100% of the logical capacity for the Open Volume is used as the physi-
cal allocating capacity of the TPV. When expanding the relevant TPV capacity using the [Thin Provi-
sioning Volume Expansion] function after migration, physical allocation is performed only to the
capacity that is used by the Thin Provisioning function for the expanded area.
*2: For [TPV] to [Open] migration, 100% of the logical capacity for the TPV is used as the logical capacity
(physical allocating capacity) of Open Volumes.
■ Migration Source Volume Requirements
• The volume type is [Open] or [TPV]
• The [Status] is [Available]
• The volume is not being formatted (when the migration target volume type is Open)
• RAID Migration is not being performed (the target volume is not specified as a migration
source or migration destination of existing RAID Migration)
• An Advanced Copy is not being performed (the target volume is not specified as a copy
source or copy destination of existing Advanced Copy)
• A Remote Advanced Copy is not being performed (the target volume is not specified as a
copy source or copy destination of existing Remote Advanced Copy)
• Balancing TPV is not being performed
• The RAID Group to which the volume belongs is not in the LDE process
• Encryption is not being performed
• The target volume is not a concatenated volume
• The total capacity of the volumes to be migrated, the capacity of the volumes being migrated,
and the capacity of TPV being balanced does not exceed 8.0TB (8,388,608MB)