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From Colm MacCarthaigh <>
Subject Re: load balancer "cluster" set
Date Mon, 31 Jul 2006 16:30:37 GMT
On Mon, Jul 31, 2006 at 12:22:03PM -0400, Guy Hulbert wrote:
> The simple solution is to buy a bigger piece of hardware or outsource
> the problem to the relevent experts.
> Trying to do meaningful load-balancing within an application will not be
> simple.  At the router it is simple.  All the required data is present
> in one spot.

Load-balancing can be implemented at any arbitrary point in the stack
(Ethernet/IP/DNS/TCP/HTTP/Application) and each has its own problems and
features. There is nothing particularly appealing about doing it at the
routing layer (though it does present a few novel options like using
anycast or a TCP redirect), and doing it there has a few problems of its

Either way, the more options and the more flexibility, the better. In
the real world, you may find that many operations use multiple 
load-balancing techniques toghether (e.g. Google uses DNS, L2, L3 and 
L4 load-balancing).

Colm MacCárthaigh                        Public Key:

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