I did post here, because I am almost sure that I am facing serious bugs in the actual version. Of course I can be wrong, however I do think that the described problems are not related to things I am doing wrong. So it is more that I intended to make the team aware of the problems, then that I think I need help .....
Because I assume bugs, I did upgrade intermediately after the install, .... however, that did not solve the noted issues ...
I also installed Ubuntu in an VM on my windows10 system and compiled XOA. And tryed to generate storage from there, which not so strange, did lead to the same error messages seen before (I tried to define storage types EXT and ZFS).
Related to ZFS, I wrote that since I did read some were that it was not yet formally supported.
Note that my server does have disks installed (not intended for XCP-ng). The disks are ZFS storage pools active when I boot the server as TrueNAS server. That should not be a problem .... IMHO.
Note that I can not detach them, since it also involves NVME-drivers on the motherboard.
Also note that the SSD use for XCP-ng has been used for other purposes before probably including ZFS-partitions. I write that here because I noted people reporting issues related to disks previously used for ZFS.