Hi Przemek, > 1. Does anyone use KOHA on virtualized servers? We do, yes. > 2. What solution did you choose KVM, LXC / LDX, VMVare, ProxmoxVE or Proxmox with ceph storage. > 4. Problems, challenges, thoughts? There are no differences with bare-metal, as far as we know. Only the many benefits that virtualisation gives you. :-) MJ