n-tier is a matter of abstraction and separation of concerns between parts of your application. It does need to involve more than 1 machine.

Multiple machines means you can do failover for higher uptime, and it also means you have literally twice as much power to put into serving your application. There is a cost to the load-balancing, so it won't exactly double your scalability, but it can get close.

In reply to Re: LAMP svrs - 1 or 2 is best ? by perrin
in thread LAMP svrs - 1 or 2 is best ? by j_c

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