xe vdi-forget uuid=c6853f48-4b06-4c34-9707-b68f9054e6fc
xe sr-scan uuid=6b24cd1c-22ad-0994-5b6b-a75389a6ddba
xe vdi-list uuid=c6853f48-4b06-4c34-9707-b68f9054e6fc params=sr-uuid sr-uuid ( RO) : 6b24cd1c-22ad-0994-5b6b-a75389a6ddba
yup, that worked, thanks 
https://xcp-ng.org/docs/api.html
Restarting the API
Sometimes, you might want to restart the toolstack (API and storage stack). You can do it with the following command from the host console (or directly with Xen Orchestra):
xe-toolstack-restart
TIP
Restarting XAPI won't affect any running VMs. However, all backup/export tasks will be removed.
I believe XO 6 is only available for XCP-ng 8.3, not 8.2.
If you are using Ronivay script for building XO, XO 6 Lite via XO (/v6) is disabled by default since about a month ago.
You need to specifically enable XO 6 lite installation in the configuration file included in Ronivays script.