But so was GFS.

And why toss in JFS? JFS is an IBM product,
and I believe IBM REALLY loves Linux, and
their business model allows for a huge
amount of contribution.

Much different than Sistina, a 2 product
company, one of which WAS GPL, but no longer.

As far a the 7.3 to 8.0 difference, I don't
use any file system or vm or raid driver that
has been out, in use, for quite some time.
And on the corp machines, no low level
infrastucture piece that is not "packaged" for
a while. Yeah, I'm a baby. In this case, I
have been aware of LVM for a while, but never
looked closely since I've been mostly out
of sysadmining for abou a year.