For my company, I've setup a mail/groupware environment that uses Postfix, OpenLDAP, Postgres, Apache, etc and am now looking at ways to make it a more redundant arrangement. All of the components have methods to help me with the lone exception of the backend mail storage for the end users. Ultimately, I am wanting to have systems at different geographic locations, not even on the same network, ideally with users able to access any of them at anytime and be able to do their thing. The users mail storage is in Maildir format which seems like it will help any replication type scenario. I can't just NFS mount the mail directories, because then my NFS server becomes my single point of failure. Do things like GFS work to handle this? If so, do they operate across slow links (not talking dial-up here, but general Internet cable/DSL type links) If it helps, our total mail volume is not that tremendous so completely instantaneous replication isn't totally necessary, but I would want fairly quick convergence (say 30 minutes or less). -- David Hollis <dhollis@xxxxxxxxxxxxxx>
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