Just fresh from a single node HCI setup (CentOS 8 + oVirt 4.4.1) I did 
yesterday on an Intel i7-8559U NUC with a single 1TB NVMe storage stick and 
64GB of RAM:

The HCI wizard pretty much assumes a "second disk", but a partition will 
actually do. And it doesn't even have to be in /dev/mapper, even if the wizard 
seems to have some logic requiring that.

But it requires a partition to be present, which you'll need to create (empty) 
by hand and which in my case was something like /dev/nvme0n1p10 where the 
wizard puts /dev/sdb. That's because the wizard will then try to put VDO on 
that storage, which requires a block layer underneath, and then puts thin 
allocation LVs on to of that for the ultimate flexibility and the ability to 
worry much more about performance than detail planning of storage allocations.

And it needs to be really empty, if there is a file system or left-overs of 
one, the Wizard will fail with a not very helpful "device xx has been 
blacklisted" or similar.

Of course, without the HCI (first choice you make in the Wizard), you can set 
up your storage, even with Gluster, in many other ways, but I've found it 
easier to stick with the HCI route, at least given the equipment I had (no SAN, 
no NFS filer).
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