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Chapter 5 Volume Management
5.2 Functions in the Action Area for Volume
5.2.7
Start RAID Migration
RAID migration (hereinafter also referred to as migration) moves an existing volume in a RAID
group or TPP to a free space in another RAID group or TPP. After migration is complete, the
migration source volume is automatically deleted.
Migration provides the following features:
•
Load balancing of host access.
•
Volume capacity expansion is available when migrating volumes (only when the volume type
is "Standard")
•
The RAID level of the volume can be changed.
•
Because creation and format of new volumes and host interface establishment are
automatically performed, users are allowed to access the data anytime without being affected
by the migration.
Migration type
The combinations of volume types (migration source volume → migration destination volume)
that can be migrated are as follows:
Standard → Standard
•
Standard → TPV (*1)
•
TPV → Standard (*2)
•
TPV → TPV
•
*1:
*2:
Requirements for a migration source volume:
•
The "Type" is "Standard" or "TPV"
•
The "Status" is "Available"
•
A format is not being performed (only when the volume type is "Standard")
•
Migration is not being performed (the target volume is not used as a migration source or a
migration destination)
•
The migration source volume is not an Advanced Copy (cascade copy) destination
•
TPV balancing is not being performed
•
LDE is not being performed for the RAID group to which the target volume belongs
•
Encryption is not being performed for the target volume
Requirements for a migration destination RAID group:
•
The maximum number of volumes are not set in the destination RAID group
Migration creates new volumes. The maximum number of volumes that can be created
depends on the ETERNUS DX Disk storage system model.
When migration from a "Standard" volume to a "TPV" volume is performed, 100% of the logical
capacity of the Standard volume is allocated as the physical capacity for the TPV. When the TPV
capacity is expanded by using the procedure in
84)
after migration is complete, the expanded area is physically allocated according to the capacity
that is used by the "Thin Provisioning Pool" function.
When migration from a "TPV" volume to a "Standard" volume is performed, 100% of the logical
capacity of the TPV is allocated as the logical capacity (the allocated physical capacity) of the
Standard volume.
ETERNUS Web GUI User's Guide
Copyright 2011 FUJITSU LIMITED
"5.2.6 Expand Thin Provisioning Volume" (page
86
P2X0-1090-02ENZ0
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