The image plug-in was not able to acquire an exclusive lock on volume: volume_name
To perform an offline image backup or an image restore, IBM® Tivoli® Storage Manager requires exclusive use of the volume.
Processing stopped.
Verify that no other application is accessing the volume. If this volume is being accessed by applications that can not be shut down during backup then perform an online image backup (snapshot with LVSA) instead. During restore of an image, IBM Tivoli Storage Manager must have exclusive use of the volume.