Has anyone ever heard of a way to synchronize multiple filesystems while keeping them completely independent? For example, suppose I have three identical drives with one EXT4, one HFS+, and one XFS partition, respectively. If I write something to the HFS+ drive, I want that file to be immediately written to the other two.

I know I could just add a simple rsync script to cron, but I like the idea of everything happening instantly.

Thanks!

-catlover2