drbd-utils : mirror/replicate block-devices across a network-connection ( https://linbit.com/drbd/ )
glusterfs : GlusterFS is a powerful network/cluster filesystem ( https://www.gluster.org/ https://github.com/gluster/glusterfs/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a inode64-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/inode64-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org