EVMS ( http://evms.sourceforge.net/ ) could do some of these things and shared the same vision as ZFS: "EVMS provide[d] a single, unified system for handling all of your storage management tasks." The memory is a bit fuzzy but I think it was a port/reimplementation from AIX or else IBM was involved. I think it died because it didn't integrate well into the kernel (like ZFS it smashed many layers into one).
Enzymes are things invented by biologists that explain things which otherwise require harder thinking. -- Jerome Lettvin