Journaling is a fairly new feature of FreeBSD, and as such, it is not very well documented yet. You may however find the following additional references useful:
A new section on journaling is now part of the FreeBSD Handbook.
This post
in freebsd-current by gjournal(8)'s developer, Pawel Jakub Dawidek <[email protected]>.
This post
in freebsd-questions by Ivan Voras <[email protected]>.
The manual pages of gjournal(8) and geom(8).
All FreeBSD documents are available for download at http://ftp.FreeBSD.org/pub/FreeBSD/doc/
Questions that are not answered by the
documentation may be
sent to <[email protected]>.
Send questions about this document to <[email protected]>.