How can I design Load Balancing for distant Datacenters? without single point of failure

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Jul 1st, 2013
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Dear Experts,


We are using the following very old and passive method of redundancy for our cload SaaS but it's time to make it approperiate. Can youplease advise:


Current issues:

1. No load balancing. IP selection is based on primary and secondary IP configurations. If Primary fails to respond, IP record for DNS changes to secondary IP with TTL=1min

2. When primary server fails, it takes around 15 min for clients to access the servers. Way too long!


The target:

A. Activate a load balancing mechanism to utilized the stand-by server.

B. How can the solution be designed to avoid single point of failure? In the previous example, UltraDNS is a single point of failure.

C. If using GSS is the solution, how can it be designed in both server locations (for active redundancy) using ordinary DNS server?

D. How can HSRP, GSS, GSLB, and/or VIP be used? What would be the best solution?


Servers are running ORACLE DB, MS SQL, and tomcat with 2x SAN of 64TB each.

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