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Troubleshooting NetScaler by Raghu Varma Tirumalaraju

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Global Server Load Balancing

Global Server Load Balancing (GLSB) does for data centers what load balancing does for servers. It directs users to the best possible resource (best data center for a resource). Best here can mean, the closest, the healthiest, or the least loaded.

GSLB uses a proprietary protocol called Metric Exchange Protocol (MEP) to obtain the metrics needed for this decision. The result of GSLB processing is an Address (A) record in response to a DNS request that the client will then use to obtain the resource.

In this section, we'll look at what a typical first time flow looks like, what some of the considerations are for GSLB to work correctly, and then move on to troubleshooting.

GSLB flow

It is important to understand the several ...

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