Hello,
I’ve written a guide on installing NixOS on an OVH server. In my example a Kimsufi with two NVMe drives.
The server needs to be booted into rescue mode, then NixOS is installed with Nixos-anywhere. Disko is used for disk partitionning and ZFS dataset creation.
English version: BeloutreBlog • Installing NixOS on an OVH dedicated server
French version: BeloutreBlog • Installation de NixOS sur une machine dédiée OVH