"There has been quite a lot of filesystem work done in the past
few kernel versions. The ext4 file system was added as a
development version in late in 2006 (Initial git commit) and was
declared stable exactly two years later. (commit to rename ext4dev
to ext4) ext4 is a nice evolution of the ext series of file systems
and provides a number of new features such as larger storage
limits, and extent based storage. See the wikipedia article on ext4
for more detail. But ext4 is still just a file system and doesn't
really compete with the newest kid on the block, ZFS.
"ZFS is the feature rich, "rampant layering violating" file
system that Sun has developed for it's version of UNIX, Solaris.
ZFS has a few key features that make linux users green with envy:
quick and easy snapshots of data, data checksumming, and
integration of several tools to manage disks and file systems."