@olivierlambert thank you for the quick answer.
To be on the real safe side this means then a replication count not lower than 3 would be useful (from my perspective).

What would happen if a node of a 3 node cluster with replication count 3 (so all nodes have a copy) fails?
Would everything stop because replication count is higher than available nodes?
(I refer to post https://xcp-ng.org/forum/post/54086)

I am working for years with XenServer/Citrix Hypervisor and Citrix products like Virtual Apps.
Meanwhile I also have XCP-NG running on an test server for a while.
Well, I decided now to build a new small cluster with XCP-NG. One reason is also the XOSTOR option.

This new pool is planned with 3 nodes and multiple SSD disks (not yet NVMe) in each host.
I am wondering how XOSTOR creates the LV on a VG with let's say 4 physical drives:
Will it be a linear LV? Is there any option for striping or other raid levels available/planned?

Looking forward to your reply.
Thanks a lot for all the good work in a challenging environment.