Doesn't AIX use "JFS"? In any case, JFS, XFS, AdvFS, and NTFS are
"journalling" (they log meta-data changes, and possibly other things,
but that's *separate* from the main structure of the FS), not
log-structured.
BSD's LFS is log-structured -- everything is appended to a log, so
blocks and inodes move around... *all* writes are done at the "end"
("tail"?) of the log.
In any case, log-structured FSes pay a large performance penalty
whenever they have to go and actually do a read off disk (for most
systems, it's probably an overall win, but for some, it could be a big
loss).
I don't know of any other log-structured FS, though. Network Appliance's
WAFL (used on their FAServers) is incredibly cool (but probably
complicated). See http://www.netapp.com/technology/level3/3002.html.
- Trung