bar log message 43185

Hi All I have 11.5UC4 + TSM. L0 archives are scheduled weekly, and L1 Mon-Sat nightly. I'm seeing following error in bar log several times a week: 15335576 56099016 (-43185) A change in physical configuration has occurred. A level 0 backup of aimsdbs1 is being performed I know that: -43185 A change in physical configuration has occurred. A level-0 backup of <space_name> is being performed. The physical configuration of the database server has changed. For example, a storage space, chunk, or logical-log file has been added or dropped, or the physical log has been moved. To guarantee a successful restore, a level-0 backup of the affected space and the root dbspace is being performed now. I'm happy to accept that no action is required but I want to know the reason. Does anyone have any idea? Regards Ali