We'd like to run a mail service in a high-availability setup, where we
could hope for no more than a few minutes worth of email ever being
lost, and any loss of email resulting in the normal notification to the
sender.
A first thought was to set up two identical servers, and replicating
mail data between the two, somehow.
Maybe the active node could keep syncing it's file systems, or
specifically the mail data, to the backup node?
Maybe zfs can be made to (almost) mirror its data across a dedicated
network?
There's no need for real HA behaviour for anything else: mail is the
only concern.
Can anyone suggest a reasonable approach that could be easily
maintained, and would make the setup reasonably HA?
There's only about a thousand mail addresses to serve, and the network
is a GB net using cheap but recent HP switches, the V1910 series.
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