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= HA array using Heartbeat - HA provides a virtual service, not a specific machine or host; Hearbeat determines which Machine/Host responds to the service.
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All communications on production cluster uses separate GbE (Gigabit Ehthernet) network that is inaccessible to/from the outside world.
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HA & HPC toptology reference:
http://www.ultramonkey.org/3/topologies/ha-lb-eg.html
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REFERENCES
Linux HA: http://www.linux-ha.org/
- Homepage for the HA products available in Linux, including Heartbeat
Mongrel: http://mongrel.rubyforge.org/index.html
- Application server software used by Ruby-On-Rails. Very very fast.
PostgreSQL:http://www.postgresql.org/"
- Database software used throughout the application.
Apache:http://www.apache.org/
- Fantastic. Best webserver in the world. Needs no elaboration.
Apache mod_proxy_balancer: httpd://www.apache.org/docs/2.2/mod/mod_proxy_balancer.html
- Very technical description of the balancer algorithms used by our load balancers.
CO-LO SPECIFICATIONS
Two OC12's(12Gb) and One OC3(3Gb) Pipes
- With diversified routes
Two redundant power substations
- One 750,000 Watt Back-Up Generator
Four SONNET rings converge into the building
- From multiple carriers
Secure environment
- 24/7 security
- Video surveillance
- 24/7 Electronic Key Card Access
Four redundant A/C Units
Inert gas FM-227 fire suppression system
Automated Network & Environmental Monitoring Systems
- Automated staff alerting
All data ports are connected at 100MB or 1GB
- Usage is graphed and monitored
SLA is guaranteed at 99.999% network uptime
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