(disclaimer: CTO of XTX)

It was a long long time ago that we were only using NFS, it ran on top of a Solaris machine running ZFS. It did its job at the very beginning, but you don't build up hundreds of petabytes of data on an NFS server.

We did try various solutions in between NFS and developing TernFS, both open source and properietary. However we didn't name these specifically in the blog post because there's little point in bad mouthing what didn't work out for us.