Nick Bond's presentation from CloudCamp Berlin on 30.04.2009

1. Load Balancing in the Cloud Nick Bond Systems Engineer Zeus Technology

2. An awful lot of load balancers... Layer 7+ App. Delivery Controllers Layer 7 Traffic Managers © Zeus Technology 2008 Slide Layer 4 Load Balancers loadbalancer.org Linux Virtual Server / IPVS Coyotepoint Cisco CSS Nortel / Alteon Microsoft NLB Barracuda Cisco ACE Radware Citrix Netscaler F5 BigIP Zeus ZXTM Pound PerlBal HAProxy nginx

5. YottaServe © Zeus Technology 2008 Slide “ We were able to demonstrate that placing the load balancer in front of the application transformed the number of concurrent users from ten into thousands – with no application modifications needed.” Jeff Rhys-Jones, Founder, YottaServe Initial application tests show that response times rose sharply - up to over 100 seconds for a page request, as the number of users were ramped up to a test version of the website in the lab After application acceleration and traffic optimization, response times were less than 100 milliseconds - a complete performance transformation

7. Gilt Groupe © Zeus Technology 2008 Slide ~400 RoR nodes Basic Load Balancer

8. Gilt Groupe © Zeus Technology 2008 Slide ~400 RoR nodes L7+ Load Balancer “ We found that with Content Caching and TrafficScript TM , the load balancer became an extension of our applications because of what it enabled us to do.” Phong Nguyen, VP R&D, Founder, Gilt Groupe

9. Load Balancers in the Cloud... Layer 7+ App. Delivery Controllers Layer 7 Traffic Managers © Zeus Technology 2008 Slide Layer 4 Load Balancers loadbalancer.org Linux Virtual Server / IPVS Coyotepoint Cisco CSS Nortel / Alteon Microsoft NLB Barracuda Cisco ACE Radware Citrix Netscaler F5 BigIP Zeus ZXTM Pound PerlBal HAProxy nginx

10. Load Balancers in the Cloud... Layer 7+ App. Delivery Controllers Layer 7 Traffic Managers © Zeus Technology 2008 Slide Layer 4 Load Balancers loadbalancer.org Linux Virtual Server / IPVS Coyotepoint Cisco CSS Nortel / Alteon Microsoft NLB Barracuda Cisco ACE Radware Citrix Netscaler F5 BigIP Zeus ZXTM Pound PerlBal HAProxy nginx Your choice of load balancers is limited... Shared L4 or dedicated L4, 7, 7+ load balancers