Hi,
the comment WRT WAL recovery and FS journals [1] is a bit misleading in
it's current form.
First, none of the general purpose filesystems I've seen so far do data
journalling per default, since it's a huge performance penalty, even for
non-RDBMS workloads. The feature you talk about is ext3 specific (and
should be pointed out as such) and only disables write ordering, meaning
that metadata and file content updates are not synchronized.
best regards,
Michael
[1] 64b3d98baaf96afea815b0c37ff918f02fda11c9