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On lør, 2004-08-07 at 20:53 -0700, Josh Tolley wrote:
> Kjetil Torgrim Homme wrote:
> > the "simple" and general method of realserver failover is duplicating
> > the servers: the director sends a copy of every incoming packet to each
> > of the server but picks the response from only one of them and sends
> > back to the client. this should handle many protocols (but not FTP or
> > protocols using challenges for authentication) without any changes on
> > the real server. this rules out DR, of course.
>
> It also rules out one of the major advantages of LVS, namely that
> several machines can share the necessary processing load.
no, you just need twice as many machines.
> Were something
> like an email cluster to use a technique like this, all kinds of
> problems could happen (then again, getting connections to fail over to a
> new real server when the current real server dies on something like an
> email cluster would be much more complicated than something like web
> servers or streaming video anyway).
yes, any protocol where the client has write access is essentially ruled
out, too.
--
Kjetil T.
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