Hi Claas,
It sounds like you need to regenerate the landscapeDescription.xml. You will probably have to reinstall HLM to get this to work.
Here are the steps to download the latest HLM and then reinstall.
1) Stop all browsers that have HLM pages open
2) Stop HANA Studio
3) Execute /usr/sap/hlm_bootstraps/<SID>/HLM/stop-hlm.sh –f
4) Check that there are no any left HLM processes from the <sid>adm user.
5) Rename the existing directories:
/usr/sap/hlm_bootstraps/<SID>/
/<hana shared>/<SID>/HLM/
6) go to service.sap.com and search for SAP HANA Lifecycle Manager
7) download HLM SP7 patch 10 and copy to a temporary directory
8) unpack in a temporary directory
9) As root user, from the temporary directory execute:
./hdbinst
This should reinstall HLM and rebuild the landscapeDescription.xml
** This resolution is also documented in note:
1986259 - How to recreate an inconsistent landscapeDescription.xml for HANA
Best Regards,
Jimmy