Re: 2 Colo's
Ian Rae <[email protected]>
| Newsgroups | gmane.comp.programming.load-balancing.general |
|---|---|
| Message-ID | <[email protected]> |
We do this for a living and have multiple LB vendor's solutions. Avoid using multiple A records, low TTL is much more feasible than it used to be and so delegating authority to the LBs which is what most GSLB solutions do works very well. Then you can run active-active sites (has some inherent challenges depending on app architecture) or active-standby (more common), or best site (also common). Everything Pete says is true so there are still technical and application architectural problems recovering browser sessions with your SaaS app if the primary data center goes dark and you failover via DNS, but there are some workarounds and since this shouldn't happen very often, its generally ok for most SaaS providers. Users know browsers can flake out and are pretty good at restarting them or simply rebooting... ian On Wed, May 27, 2009 at 3:00 PM, Dane Ruyle <[email protected]> wrote: > Hi all, > > I'd like to hear your input on the best way to bring a second collocation > facility online. We are a SAAS company. Basically, our service is all tied > to a domain name; the www record. > > It was my intent to use 2 A records to the WWW lookup. Then, use GSLB to > control the traffic. > > This works fine when both sites are up and running, but what happens when > one goes down - rely on the built-in failover mechanism is DNS (the second A > record)? > > There's a GSLB Page of Shame http://www.tenereillo.com/GSLBPageOfShame.htm > > Would love to hear your input as I am going to be bringing a second one > online. > > Thanks for your time, > dane > > > ------------------------------ > Windows Live™: Keep your life in sync. Check it out.<http://windowslive.com/explore?ocid=TXT_TAGLM_BR_life_in_synch_052009> > > _______________________________________________ > lb-l mailing list > [email protected] > http://vegan.net/mailman/listinfo/lb-l > Searchable Archive: http://vegan.net/lb/archive > http://lbdigest.com Load Balancing Digest > http://lbwiki.com Load Balancing Wiki > > _______________________________________________ lb-l mailing list [email protected] http://vegan.net/mailman/listinfo/lb-l Searchable Archive: http://vegan.net/lb/archive http://lbdigest.com Load Balancing Digest http://lbwiki.com Load Balancing Wiki