Cisco Cisco Collaboration Server Dynamic Content Adapter
DCA 2.01 Administration and Configuration Guide
About DCA Caching 79
The Copy Server
The Cisco Copy Server is a mechanism that allows the DCA to store pages that have
been forced from the DCA cache but have not yet expired. In this way, the pages still
remain available to users. Unlike the DCA Cache, which stores pages in memory, the
Copy Server writes pages to disk. The Copy Server is installed automatically when
you install the DCA.
been forced from the DCA cache but have not yet expired. In this way, the pages still
remain available to users. Unlike the DCA Cache, which stores pages in memory, the
Copy Server writes pages to disk. The Copy Server is installed automatically when
you install the DCA.
Although there is usually no reason to modify the Copy Server's default settings, you
can change certain defaults if desired. Note that Copy Server configuration does not
significantly affect DCA performance.
can change certain defaults if desired. Note that Copy Server configuration does not
significantly affect DCA performance.
How the DCA Searches for Stored Pages
When a user requests a previously accessed page during a DCA session, the DCA
searches in this order for a stored copy of the page in:
searches in this order for a stored copy of the page in:
1. The Output cache
2. The Response cache
3. The Copy Server
If an unexpired copy of the page is not available from any of these sources, the
request is then forwarded to a Web content server.
request is then forwarded to a Web content server.
The Static Cache
In non-SSL (HTTP) mode, non-text files (such as images) are typically not requested
through the DCA: they are requested and delivered to participants directly from a
Web content server. The DCA does not cache non-text files when used in non-SSL
mode.
through the DCA: they are requested and delivered to participants directly from a
Web content server. The DCA does not cache non-text files when used in non-SSL
mode.
In SSL (HTTPS) mode, however, non-text files are always and automatically
requested and served through the DCA; this is to avoid the security warnings
participants would otherwise receive due to content derived from different sources.
requested and served through the DCA; this is to avoid the security warnings
participants would otherwise receive due to content derived from different sources.
To speed performance, when used in secure mode, the DCA stores non-text files in
a special cache named the Static cache. You can modify the size and other attributes
of the Static cache.
a special cache named the Static cache. You can modify the size and other attributes
of the Static cache.