Redistribute volumes

You redistribute volumes to move volumes back to their preferred controller owners. Typically, multipath drivers move volumes from their preferred controller owner when a problem occurs along the data path between the host and storage array.

Before you begin

  • The volumes you want to redistribute are not in use, or I/O errors will occur.
  • A multipath driver is installed on all hosts using the volumes you want to redistribute, or I/O errors will occur.

    If you want to redistribute volumes without a multipath driver on the hosts, all I/O activity to the volumes while the redistribution operation is in progress must be stopped to prevent application errors.

About this task

Most host multipath drivers attempt to access each volume on a path to its preferred controller owner. However, if this preferred path becomes unavailable, the multipath driver on the host fails over to an alternate path. This failover might cause the volume ownership to change to the alternate controller. After you have resolved the condition that caused the failover, some hosts might automatically move the volume ownership back to the preferred controller owner, but in some cases, you might need to manually redistribute the volumes.

Procedure

  1. Select Storage > Volumes.
  2. Select More > Redistribute volumes.
    The Redistribute Volumes dialog box appears. All volumes on the storage array whose preferred controller owner does not match its current owner appear in this dialog box.
  3. Select one or more volumes that you want to redistribute, and confirm that you want to perform the operation.

Result

System Manager moves the selected volumes to their preferred controller owners or you might see a Redistribute Volumes Unnecessary dialog box.