High Availability Mail Server (sort of)

I have a pair of OD servers that I am trying to configure to provide a warm failover (warm because it will be somewhat manual). These servers are XSAN client machines and I am trying to figure out how to force the mail server to use the SAN for its mail files rather then /var on the boot HD. Is there a config file somewhere that contains the path for the mail db and associated directories so that I can respecify them to be on the SAN? I looked in the postfix config files but I suspect they must be in a cyrus config file somewhere. TIA.