Changing Controller Ownership of a Volume

The preferred controller owner for a volume is initially selected by the controller when a volume is created.

Under certain circumstances, ownership of a volume is automatically shifted so that the alternate controller becomes the current owner. For example, if the controller tray that is the preferred controller owner is being replaced or undergoing a firmware download, ownership of the volumes is automatically shifted to the other controller tray, and that controller becomes the current owner of the volumes. There can also be a forced failover from the preferred controller to the other controller because of I/O path errors.

Additionally, you can manually change the current owner of a volume to improve performance. For example, you might want to change the controller ownership of one or more volumes if you notice a disparity in the total Input/Output per second (IOPS) of the controllers such that the workload of one controller is heavy or is increasing over time while that of the other controller is lighter or more stable.

Note: You can change the controller ownership of a standard volume or a snapshot reserve volume. You cannot manually change the controller ownership of a snapshot volume because it inherits the controller owner of its associated base volume.

Use the Redistribute Volumes button to cause all volumes to return to their preferred controller owners.

To change a volume's controller owner:

  1. Click Sun StorEdge 6130 Configuration Service.
  2. The Array Summary page is displayed.

  3. Click the array on which you want to change controller ownership of a volume.
  4. The Volume Summary page for that array is displayed.

  5. Click volume for which you want to change controller ownership.
  6. The Volume Details page is displayed.

  7. In the Owning Controller field, select either A or B.
  8. Note: If the Owning Controller selection is the same as Preferred Controller selection , then changing the owning oontroller will also change the Preferred Controller selection to match. If the Owning Controller selection is different from the Preferred Controller selection, then changing the owning controller will change only the owning controller and not the preferred controller.

  9. Click OK.

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