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Administrator Guide

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Migrating Volumes With Live Migrate
Live Migration moves a volume from one Storage Center to another Storage Center with no down time.
Live Migration Requirements
To create Live Migrations, the requirements listed in the following table must be met:
Requirement Description
Storage Center version The source and destination Storage Centers must be running version 7.1 or later.
NOTE: Dell recommends that both Storage Centers run the same version
of Storage Center software.
Storage Center license No additional license is necessary.
Storage Manager configuration The source and destination Storage Centers must be added to Storage Manager.
Storage Center communication The source and destination Storage Centers must be connected using Fibre Channel
or iSCSI, and each Storage Center must be defined on the other Storage Center.
• On the source Storage Center, the destination Storage Center must be defined as
a remote Storage Center.
• On the destination Storage Center, the source Storage Center must be defined as
a remote Storage Center.
Replication QoS definitions Replication Quality of Service (QoS) definitions must be defined on the source
Storage Center.
Server
• The source and destination Storage Centers must be mapped to a server.
• MPIO must be enabled on the destination server to prevent I/O interruption during
a Live Migration.
Live Migration Roles
Live Migrations have two roles: source and destination. These roles determine the active volume that is servicing I/O. The roles can be
swapped one time, either automatically or manually.
In the following examples, the server sends an I/O request that modifies the source volume. The changes to the source volume are
replicated to the destination Storage Center over Fibre Channel or iSCSI.
Before Live Migration
Before a Live Migration, the server sends I/O requests only to the volume to be migrated.
Figure 11. Example of Configuration Before Live Migration
1. Server
2. Server I/O request to volume over Fibre Channel or iSCSI
3. Volume to be migrated
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Storage Center Administration