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# About offline or in-service migration

You can migrate enclosures into HPE OneView offline or in-service.

Offline | Servers are powered off before migration Advantages: Faster migration time and partially-stacked domain support
In-service | Servers remain powered on during migration Advantage: Minimum downtime in server connectivity

Both types of migration require that:

- All blocking issues, as identified in the compatibility report, are resolved

- All acknowledgements are understood and accepted, including additional acknowledgments for in-service migration (for example, BIOS and SR-IOV)

In addition, in-service migration requires:

- A fully stacked enclosure in a dual ring or left/right vertical stacking link configuration. See recommended stacking connections in the HPE Virtual Connect for c-Class BladeSystem Setup and Installation Guide.

| NOTE: Changes made during in-service migration do not take effect until the server is rebooted for the first time following the migration. Plan a reboot if one of the acknowledgements, such as an SR-IOV virtual function configuration, indicated a change which would impact your operation.

If the additional in-service migration conditions cannot be met, an offline migration is recommended.

#### More information

About blocking issues during migration
About migration acknowledgments

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