"Theodore started his presentation with an apology. He had
prepared a very nice demonstration of ext4 on his laptop but it had
been stolen at the train station. Luckily he did have a backup of
his presentation, just not the demo.
"He gave a quick overview about the ext3 filesystem and what is
so good about it; ext3 is widely used and is pretty much the de
facto Linux filesystem. It also has a very diverse developer
community with contributors from all the major distributions. That
is a bigger point then you would at first assume because until
recently Red Had did not officially support the XFS filesystem and
it did not have any of its own developers working on it. JFS is a
great filesystem but the fact that pretty much all contributors are
IBM employees has likely contributed to JFS' lack of success. Big
distributions want someone who knows the ins and outs on their own
team before they can support something as important as a filesystem
and ext3 developers are everywhere.
"The ext3 filesystem has its fair share of problems which ext4
should fix. Currently ext3 filesystems can only be up to 16 TB in
size and there is a limit of 32,000 directories. The resolutions of
the timestamps on files is only one second and there are
performance problems, ext4 fixes all these issues."