This page is about ZFS-fuse, the ZFS attempt for Linux
zfs is a filesystem.
I have abandoned this filesystem because it is about as closed as it can get without being officially closed. It's hampered by awkward licensing and patents making it intentionally incompatible with the GPL.
Even if it was made to work perfectly, running under FUSE is sub-optimal.
It also seems horrifyingly complex to use. Seriously.
An interface for userspace programs to export a filesystem to the Linux kernel.
Running things under FUSE is sub-optimal. It's better to run under the kernel directly. However, userland stuff is the only way to achieve certain effects, like everyday user control or to work around licensing issues.
FUSE IS NOT SECURE - Noted on https://github.com/libfuse/libfuse. See issue #15
A userland-level raid type solution. This might have replaced my use of rsync, which can only be good.