WebSphere Virtual Enterprise, Version 6.1.1
             Operating Systems: AIX, HP-UX, Linux, Solaris, Windows, z/OS


Configuring cell affinity in a multi-tiered environment

You can configure your network to contain multiple tiers of on demand routers (ODRs). In multi-tiered configurations, you must configure the ODRs in one tier independently from the ODRs in the other tiers, because the ODRSESSIONIDs of two different tiers must not be the same.

Before you begin

You must enable cell affinity and configure the ODRs. See Creating and configuring ODRs and Enabling cell affinity for details.

About this task

An example environment for configuring cell affinity might include a cluster of ODRs that distribute load to multiple IBM Portal application servers at the front-end of the network, while at the back-end there are clusters of ODRs that distribute load to multiple Web content managers.

There are three important configuration requirements for this task:
  1. Within a given tier, any generic server cluster configurations you create for cell affinity must refer only to ODRs within that tier.
  2. Within a given tier, the ODR session identifier cookie name, which is named ODRSESSIONID by default, must be unique for all the other tiers. You must configure this cookie name as a custom property on each ODR within that tier, as described in the procedure in this topic.
  3. If you are using the highly available (HA) plugin configuration generator, each plugin-cfg.xml configuration must define the ODR session identifier cookie name to use the IBM HTTP Server to configure ODR affinity. To define the ODR session identifier cookie name, define an additional cell-wide custom property associated with the plugin-cfg.xml generation configuration: ODCPluginCfgOdrSessionIdCookie_<configname>=<CookieName>. For more information on configuring the HA plug-in configuration generator, see the Configuring an on demand router to dynamically update the Web server plug-in configuration topic.

Procedure

  1. From the administrative console, select Servers > On Demand Routers > <odr_name>.
  2. Expand On Demand Router Properties.
  3. Click On Demand Router Settings > Custom Properties > New.
  4. Type odrSessionIdCookieName for the name value.
  5. Type the new cookie name. For example, ODRSID_TIER1.
  6. Repeat steps 3 through 5 for every ODR within the tier.



Related information
Creating and configuring ODRs
Configuring ODRs
Cell affinity function
Enabling cell affinity
Defining generic server clusters for remote ODR cells
pluginMergebat|.sh script
Task topic    

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Last updated: Oct 30, 2009 1:32:42 PM EDT
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