When volumes are created, they are assigned a preferred owner controller. The owner controller of the volume may shift from the preferred controller when the controller is being replaced or is undergoing a firmware download. In addition, multipath drivers move volumes from their preferred controller owner when a problem occurs along the data path between the host and the storage array. When you redistribute the volumes, you cause the volumes to move back to their preferred controller owners.
Note: Redistributing the volumes while an application is using the affected volumes causes I/O errors unless a multipath driver is installed on the data host. Therefore, before you redistribute volumes, verify either that the volumes are not in use or that there is a multipath driver installed on all hosts using the affected volumes.
To redistribute volumes:
The Array Summary page is displayed.
The Volume Summary page for the selected array is displayed.
The General Setup page is displayed.
The Redistribute Volumes confirmation dialog box displays.