Technical data

Brocade ServerIron ADX Advanced Server Load Balancing Guide 77

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Content-aware cache switching

Debug commands

You can configure the following command to enable debugging for enhanced policy-based caching.

ServerIronADX(config)#server debug-policy-caching

Syntax: server debug-policy-caching

NOTE

The server debug-policy-caching command impacts performance and should be used for debugging

purposes only. Output for this command is sent to the BP.

Content-aware cache switching

Content-aware cache switching (CSW in a TCS environment) uses information in the header of an

HTTP request to determine how or if content should be retrieved from a cache server. Using the text

in a URL string, the ServerIron ADX sends a request from a client to a cache server or to the Internet

according to user-defined policies.

You can configure content-aware cache switching on the ServerIron ADX to do the following:

• Group cache servers by content; for example, GIF files can be cached on one cache server and

HTML files on another

• Cause HTTP requests containing a given URL string to always go to the same cache server,

minimizing content duplication among cache servers

• Use information in the URL string or Host header field of an HTTP request to determine how the

requested content should be cached

• Explicitly direct requests for dynamic content to the Internet, rather than to a cache server

• Use directives in the HTTP 1.0 or 1.1 header to determine whether requested content should

be cached

NOTE

Content-aware cache switching utilizes the resilient hashing mechanism as described in “Controlling

traffic distribution among cache servers”.