HAH! I never said or suggested open source; open source is great and many valid and valuable applications exist that are, but storage is special.
Storage requires ENORMOUS engineering effort, post deployment support, and continuous improvement. As such, open source Storage solutions invariably start life as a commercial product (eg, Sun zfs) or as a wholly owned and funded development project (eg Red Hat gluster, ceph.) I wrote more in depth about this in this thread if you want to torture yourself reading it: https://forum.proxmox.com/threads/shared-remote-zfs-storage.159929/
fwiw, zfs was released into open source in 2005. it took another 15 years to gain maturity, and only recently getting new major features (draid, raidz expansion, etc.) it takes a LOT OF WORK. The short version- if it brings you value don't be afraid to pay for it.
