Site Selector component

Site Selector acts as a name server that works in conjunction with other name servers in a domain name system to load balance among a group of servers using measurements and weights that are gathered. You can create a site configuration to let you load balance traffic among a group of servers based on the domain name used for a client's request.

A client submits a request for resolution of a domain name to a name server within its network. Name server forwards the request to the Site Selector machine. Site Selector then resolves the domain name to the IP address of one of the servers that has been configured under the site name. Site Selector returns the IP address of the selected server to the name server. The name server returns the IP address to the client.

Metric Server is a system monitoring component of Load Balancer that must be installed in each load-balanced server within your configuration. Using Metric Server, Site Selector can monitor the level of activity on a server, detect when a server is the least heavily loaded, and detect a failed server. The load is a measure of how hard the server is working. By customizing system metric script files, you can control the type of measurements used to measure the load. You can configure Site Selector to suit your environment, considering such factors as frequency of access, the total number of users, and types of access (for example, short queries, long-running queries, or CPU-intensive loads).

Collocation
High availability
Client to server affinity
Rules-based load balancing
Wide area load balancing
Alerts
Concept topic    

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Last updated: January 17, 2013 11:24 AM EST
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