The current owner of a logical drive is the controller of an active-active
The current owner may not be the preferred owner
There can also be a forced failover from the preferred controller to the other controller because of I/O path errors. This is reported with a critical entry in the event log, and will be reported by the Enterprise Management software to alert e-mail and SNMP destinations.
Use the Change Controller Ownership option to change both the current and the preferred owner for a selected array.
To shift logical drives away from their current owners and back to their preferred owners, use the Redistribute Arrays option.