On Wed, Nov 11, 2009 at 3:27 PM, Steven Alligood <[email protected]> wrote:
> On 11/11/2009 03:19 PM, William Attwood wrote: > >> Hello-- >> >> How does one accomplish geographical load balancing? With that in mind, >> what about geographical failover? Example, I have a data center (DC) in >> Dallas, and another in Salt Lake. How do I re-direct traffic if Dallas >> goes >> offline? >> >> Just a project I'm diving into. colo-specific load balancing and >> failover is accomplished, now we need to protect against the data center >> going offline, and speed of access to machines. I see how I can do >> geographical failover with a geographical load balancer, however, do I >> need >> 2 geographical load balancers if one of them goes offline? >> >> Has someone here worked on a project of this magnitude? >> >> >> > It';s been several years since I have set that up, but the old alteons (now > owned by nortel) would do geographical load balancing with one in each > location. > > Basically, you setup your auth dns to point to each location, with any > subdomain in DNS delegated to the load balancer. It would then give out dns > based on which one it found to be quicker, etc, and in an outage would give > just itself out for it's local farm. > > Of course, if you are doing IPv6, check out the anycast stuff. Quite > amazing. > > -Steve > > > > /* > PLUG: http://plug.org, #utah on irc.freenode.net > Unsubscribe: http://plug.org/mailman/options/plug > Don't fear the penguin. > */ > If one site goes offline, won't that mean 50% of my traffic also goes offline, depending on which IP DNS feeds back? I may have misunderstood you. -- Take care, William Attwood Idea Extraordinaire [email protected] Stephen Leacock<http://www.brainyquote.com/quotes/authors/s/stephen_leacock.html> - "I detest life-insurance agents: they always argue that I shall some day die, which is not so." /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
