Date: Mon, 12 Aug 1996 20:04:37 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: terry@lambert.org (Terry Lambert) Cc: michaelh@cet.co.jp, freebsd-hackers@freebsd.org Subject: Re: Load-balancing box Message-ID: <199608121804.UAA07814@labinfo.iet.unipi.it> In-Reply-To: <199608121626.JAA25431@phaeton.artisoft.com> from "Terry Lambert" at Aug 12, 96 09:26:02 am
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> > A designated IP number can be setup so that when it hits the box it > > translates it to one of the IP addresses for the multiple servers sitting > > behind it. Otherwise it just functions as bridge. ... > > I think this is only marginally more useful than using DNS to set > up cluster aliases. Agreed. > The whole problem is that you connect to an address instead of a service > in the first place -- this type of load balancing assumes all clients > have statistically identical duration, and doesn't truly balance the > load between the boxes. For example, if I have 3 boxes, and 300 incoming > connections are made, and 200 of them leave, one box can have 100 > connections and the other two can be idle. Statistically this is _very_ unlikely. You will not have perfect balancing, but not this kind of unbalancing. Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================
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