Open Lustre is a full working Lustre filesystem - MGS, MDT, an OST per node, active-active HA with failover - brought up on GCP or Azure with one command. The unconventional part is that the OSTs sit on cloud object storage, not disks. That is possible because of objbacker.
Source: [Hacker News](https://github.com/zettalane-systems/open-lustre-cloud)