(...) I would suggest looking at DRBD Proxy instead, as it is designed to
run over slow/unstable links, but it is asynchronous, so be advised that
consistency is not always guaranteed.
For what I know of drbd-proxy, consistency is in fact guaranteed, though
the secondary node may of course be out of date.
However, the proxy is probably more expensive than buying a pair of GigE
adapters and having a specialist install the cable.
We've been running DRBD for a year over wimax (60Mb/s full duplex)
without a proxy and it was slow and reacted very badly to the natural
unreliability of the link.
We ended running disconnected most of the time, and synchronizing in
off-peak time but even that flawless.
A few years ago the docs used to advice against using even a switch
between the nodes...
So get as good a network as you can for DRBD.
Lionel Sausin.
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