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manc_63343
May 04, 2011Nimbostratus
How do other co's use Global Load Balancing with multiple DC?
How do companies like google, yahoo use global load balancing accross multiple data centers? When I do nslookup I see they are doing DNS round robin within each data center.
nslookup gmai...
hooleylist
May 05, 2011Cirrostratus
Hi Manc,
Some major services do use a single IP. You can check netcraft for some examples that are using GTM with a single IP response per A query. When clients to get multiple IPs in the same datacenter, it could be multiple virtual servers that all do a hash based load balancing/persistence to get clients back to the same app instance. Or they could have shared memory/database for session information and not need to persist sessions to the same application instance. There are quite a few options in this area.
Here's an interesting discussion on ServerFault with a few relevant points:
http://serverfault.com/questions/69870/multiple-data-centers-and-http-traffic-dns-round-robin-is-the-only-way-to-assure
Are you trying to address something specific in your situation?
Aaron
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