[ILUG] Class C Addresses
colm at tuatha.org
Wed Nov 7 18:41:22 GMT 2001
On Wed 07 Nov 2001 17:14, Kate wrote:
> Imagine how simple load balancing would be, if you had ten
> webservers in a load balanced set, each with a unique ip, all round
> robin DNS'd to the same hostname.
That's not load-balancing, that's load distribution. You have no
guarantee that the servers will receive even approximately-equal
loads, and no account can be taken of servers with differing capacity,
or of varying "busyness". The BigIP load-balancer (for example; I've
not seen antefacto's in action) can take account of lots of factors in
deciding which server is "it" for a particular request, including a
user-specified weighting, SNMP results from the server, average
DNS round-robining is frequently very *unequal*, because you'll get
some big users hanging onto the same IP address, and loading one
Working for a company which produces a load-balancing *product*, I'm a
little surprised you're not familiar with this...
Colm Buckley : Systems Architect @ NewWorld Commerce
Business: +353 1 4334334 / colm at nwcgroup.com / http://www.nwcgroup.com/
Personal: +353 87 2469146 / colm at tuatha.org / http://www.tuatha.org/~colm/
Tantric sex is like waiting for a plumber - stay in all day and nobody comes.
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