I assessed the tool on a CentOS 7 system today. It can't run on older CentOS 6. It will generate core dump.
My testing went well. I was able to mount ZeroFS as NFS and write a 100M file to the mount point. The file persists after I deleted ZeroFS cache.
My plan is to use it for backup process. If we don't have such tool, we would need to prepare a large Filesystem stage area, then run rclone to upload to cloud space. With this tool, I can mount it on Backup server, rsync file server a large Filesystem to the ZeroFS mount point, eliminating stage area.
Will ZeroFS support large Filesystem size about 800GB?