That page dates from when we were moving our users off the old NetApp / Sun / UW-IMAP version of Hermes onto the new Linux / Cyrus version, with a 10x quota increase. My colleague David Carter had extended Cyrus with application-level replication, so our new mail storage architecture was (and still is) a sharded cluster with multi-site replication. David’s replication code was later adopted by Fastmail and incorporated into upstream Cyrus. It was pretty cutting-edge at the time. http://fanf2.user.srcf.net/hermes/doc/talks/2004-02-ukuug/