change storage server ip address

Hi all,

I have to move my OST appliance to new IP backup segment, it means to change storage server definition in Credentials. But there are still plenty of valid backups using this target. 

I could not find out how to change ip address, registraton name (it is derived from ip address) of used storage server on the fly. Even NBU cannot delete the registered storage server because there are disk pool and storage unit with valid backups.

Please, do you have any idea how to solve this?

Thanks

lumir