Re: 2 Colo's

Hi,

 

My name is Juan Carlos Cañete (Radware-Alteon Technical Consultant for EMEA) and I'm very happy to see how this article comes now and then to the nowadays. In this forum I have seen the people "hate" this article but for me it is perfect because it has helped me a lot of times to show customers that the problem described at it can be overcome with ADC solutions.

 

I don't know if you are using ADC solution in your actual facility but I'm sure you are looking for fast service fail over, optimization and high availability for your applications in case of failure or disaster. DNS resolution is only the first tier for a GSLB and you must be able to use other tiers, like the article describes, in order to guarantee a problem with the DNS resolution. The final thought from the article can be summarize to avoid using multiples sites because there is not a 100% perfect solution for it. I can't agree in this argument because if you have only one site you can't guarantee your applications to be available 24x7. In the same article there are examples to kill the GSLB like DoS attack to one site, OK, what will happen if you have only one site and you are under DoS attack?

 

ADC solutions can help a lot under such situations because in its responses can redirect the users to other sites that are not congested, I mean, under attack and your clients will be available to get access to your applications/services. The customer experience and the amount of GSLB developed, not only by Radware, it is the best example that the article is just something alarmist based in theoretical situations.

 

My two cents,

Juan Carlos 

 

De: [email protected] [mailto:[email protected]] En nombre de Dane Ruyle
Enviado el: miércoles, 27 de mayo de 2009 21:01
Para: Load Baalancing
Asunto: [load balancing] 2 Colo's

 

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
 

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