6.3.3 Web server plug-in failover tuning

IBM HTTP Server Plug-in uses an XML configuration file called plugin-cfg.xml to determine information about the WebSphere cell it is serving. There are some settings in the plug-in file that directly affect how the plug-in works in a workload management environment. In WebSphere V6, all of these settings can be modified using the administrative console. Plug-in file tags related to workload management and failover are:

• You can change the workload distribution policy in the configuration file.

• You can change the retry interval for connecting to a cluster member marked as down.

• You can change connection timeout settings to bypass the operating system timeout.

• You can divide the servers into a primary server list and a backup server list. This is a feature available since WebSphere Application Server V5, also called two-level failover support.

• You can change the maximum number of connections that will be allowed to a server from a given plug-in. If this attribute is set to either zero or -1, there is no limit to the number of pending connections to the application servers. The default value is -1.

• You can change the refresh interval for the reloading of the plug-in configuration file.

For details on these performance tuning options, see 18.1.4, IBM HTTP Server Plug-in.

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