WMS Cache Proxy - Cache properties

Updated: December 16, 2009

Applies To: Windows Server 2008, Windows Server 2008 R2

You can configure the following options on the Cache tab for this plug-in.

WMS Cache/Proxy plug-in - Cache properties tab

 

Item Description

Enable Caching

Select this option to enable this server to cache content by streaming it from the origin server, if it must do so to fulfill a client request.

Cache Settings

Use the settings in this area to specify the following cache directory properties:

  • Limit Disk Quota (MB). Select this option and specify the amount of disk space available in the cache directory for storing cached content. If you specify a storage capacity for the cache directory, when the quota is reached, cached content will be deleted from the cache directory, beginning with the oldest item that has not been delivered to clients. If you do not specify a storage capacity for the cache directory and when there is insufficient disk space available for storing additional cached content, cached content will be deleted from the cache directory, beginning with the oldest item that has not been delivered to clients.

    Cached content actively being streamed by clients is marked for deletion and is deleted when the last user session ends. If another client requests cached content marked for deletion, this server will cache another copy of the content from the origin server to fulfill the request.

  • Limit Archive Quota per Stream (KB). Select this option to specify the amount of disk space available in the cache directory for storing any single on-demand file that is created from a live stream by the Play While Archiving feature.

  • Enable Freshness Check. Select this option to allow this server to check the cache expiration property of cached content when it is requested by clients. If the content is set to expire at a time that has passed, this plug-in opens a connection to the origin server to verify that the cached content is still current by comparing it to the content on the origin server. A cache hit occurs if the cached content matches; a cache miss occurs if the cached content does not match. If the origin server is unavailable or cannot provide the requested content, this server returns an error message to the client stating that the content cannot be found.

  • Enable Play While Archiving. Select this option to allow this server to start streaming content requested by clients without waiting until the content from the origin server is completely cached. A partially-cached file can be used as an on-demand source 60 seconds after caching starts.

  • Cache Directory Path. Select this option to specify the location on this server where cached content is stored. The default value is %SystemDrive%\WMSCache.

Caching Speed

Select one of the following options that specify the speed at which this server caches content from the origin server, if it must do so to fulfill a client request.

  • Maximum Available Bandwidth. Choose this option to cache content from the origin server as fast as the network will allow.

  • Content Bit Rate. Choose this option to cache content from the origin server at the same bit rate as the requested content bit rate. Note that for multiple-bit-rate content, the caching speed is the same as the average bit rate of the content.

  • Kbps. Enter a value in this box to specify the bit rate at which this server caches content from the origin server.

Disk Usage

Use this information in this area to view how much of the disk quota in the cache directory is used by cached content and how much remains available for caching content. You can also click Clear Cache to empty the cache directory of all cached content.

Cached content actively being streamed by clients is marked for deletion and is deleted when the last user session ends. If another client requests cached content marked for deletion, this server will cache another copy of the content from the origin server to fulfill the request.

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