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How you manage your applications also depends on your WebSphere topology. Refer to 1.2.6, Levels of WebSphere system availability for additional information about WebSphere HA levels. For an application update, we distinguish between the following possible topologies:
| Multiple cells environment |
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| Single cell, multiple clusters |
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| Single cell, single cluster |
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We assume a minimum of two HTTP servers and a network sprayer (we use the WebSphere Edge Components' Load Balancer throughout this chapter) for all our scenarios. Having only one HTTP server would introduce a single point of failure. In addition, updating static content on the HTTP server might become an issue if there is only one HTTP server. |
