Implementing ISA Server Caching in C#

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Implementing ISA Server Caching
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file size can be configured for each disk partition. The maximum size of a single cache file is 64 gigabytes (GB). If you require a larger cache store, you can distribute it over different drives.
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Quick recovery ISA Server quickly rebuilds the directory of cached objects at startup, even after an abnormal termination. Efficient cache updates ISA Server automatically determines which objects to retain in the RAM cache. This decision is based on the likelihood of a user s again requesting the same object, which is determined by how recently and how frequently an object is accessed. Automatic cleanup ISA Server removes objects that have not been accessed recently or frequently when the disk space that is allocated to the cache approaches capacity.
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ISA Server Enterprise Edition uses Cache Array Routing Protocol (CARP) to distribute the cache efficiently across multiple ISA Server computers. ISA Server Enterprise Edition is discussed in detail in 12, Implementing ISA Server 2004, Enterprise Edition.
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How ISA Server Restricts Content
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ISA Server does not cache all content that is requested by Web clients. Table 6-1 describes how ISA Server restricts the content that it caches.
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As you write the exam, remember that ISA Server does not cache all content. If you see an exam question in which some content is not being cached, one possible reason is that the content is not cacheable. You can modify which types of content are cached.
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Table 6-1 ISA Server Caching Restrictions
Restriction ISA Server does not cache responses to requests that contain the following HTTP response headers.
Description Cache-control: no-cache Cache-control: private Pragma: no-cache www-authenticate Set-cookie Authorization, unless the origin server explicitly allows this by including the cache-control: public header in the response Cache-control: no-store.
ISA Server does not cache responses to requests that contain the following HTTP request headers.
Lesson 1
Caching Overview
Note For more information about Web pages and caching, see the article HOW TO: Prevent Caching in Internet Explorer, in the Microsoft Knowledge Base at http://support.microsoft.com/ support/kb/articles/Q234/0/67.asp.
What Is Web Chaining and Caching
Some organizations include multiple locations with computers running ISA Server deployed in each location. In this scenario, you can combine caching with Web proxy chaining to optimize caching performance. Web proxy chaining is useful when your organization has multiple branch-office locations, but all Internet requests are routed through one location at the head office. In this scenario, you can install ISA Server in each office and then configure ISA Server at the branch offices to route all Internet requests to the ISA Server computer at the head office. One of the benefits of using Web chaining is the accumulated caching on ISA Server. If all the servers running ISA Server in the branch offices are configured to forward their requests to the head-office ISA Server, the head-office ISA Server will develop a large cache that contains many requested items. Moreover, the local ISA Server will build up a cache of the most requested items from the branch office. The combination of caching at the local branch office and at the head office increases the chances that the Internet content can be delivered to the client without downloading it again from the Internet. The following steps and Figure 6-3 describe how Web proxy chaining works in this branch-office/main-office scenario: 1. The client sends a request for Web content to the Web caching server at the branch office. If the Web caching server at the branch office contains a valid version of the Web content in its cache, it will return the content to the requesting user. 2. If the content requested by the branch-office user is not contained in the branchoffice server s cache, the request is forwarded to an upstream Web caching server in the Web proxy chain. 3. If the upstream Web caching server has a valid copy of the requested content in cache, the content is returned to the branch-office Web caching server. The branch-office Web caching server places the content in its own Web cache and then returns the content to the branch-office user who requested the content. 4. If the upstream Web caching server at the main office does not contain the requested content in its cache, it will forward the request to the Web server on the Internet. The Internet Web server returns the requested content to the main-office Web caching server. The Web caching server at the main office places the content in cache.
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