[OpenIndiana-discuss] OpenIndiana/ZFS mail server HA config

[Hans J. Albertsson]

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.