This section deals with the problems of running a high-volume web site on a number of physical servers. These problems are roughly:
Connecting the servers together.
Tuning individual servers to get the best out of the hardware and Apache.
Spreading the load among a number of servers with
mod_backhand.
Spreading your data over the servers with Splash
so that failure of one database machine does not crash the whole
site.
Collecting log files in one place with rsync (see
http://www.rsync.org/ ) — if
you choose not to do your logging in the database.