another option for server syncing is to auto iscsi or aoe and add the remote
block device to a raid1 of the storage drive. The up side of this would be
online syncing but down down side(s) are network bandwidth during sync,
inability for linux md driver to skip already synced blocks.
A workaround for those downsides is that you could just keep the remote
server's drive(s) in the raid all the time. That way they will always be in
sync or near it. Still have a bandwidth concern but it would be smaller.
Should probable use a dedicated network connection between the servers.
If the main machine crashes, the drives could just be mounted up on the
second machine.
still use rsync to bring config files over and otherwise keep the two
systems synced. rsync can typically handle an entire linux server without
blowing up.
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