The specified volume is assigned to a user-defined volume group and might be receiving I/O requests. The safe option prevents you from deleting a fixed block volume that is assigned to a user-defined volume group. Because you have attempted to delete at least one volume that is assigned to a user-defined volume group and you used the safe option, no volumes have been deleted. Use the DS Command-Line Interface (CLI) lsfbvol command to determine the user-defined volume group to which the specified volume is assigned.
Either remove the specified volume from the user-defined volume group and then resubmit the task, or resubmit the task without the safe option to delete a volume that is assigned to a user-defined volume group.