Product Documentation

Verifying Video Caching

Apr 13, 2017

Graphs and data on the Monitoring page, Dashboard page, and Usage page help you evaluate the benefits provided by your video caching configuration. The data-reduction ratio resulting from video caching (similar to the overall compression ratio) is displayed on the Dashboard, on the video caching monitoring page, and on the Usage graph page. Also, hovering over the Data Reduction ratio on the Dashboard page displays the caching benefit percentage along with compression benefit percentage on the supported platforms.

The purpose of caching is not just to save bandwidth, but also to increase performance, decrease load on the video servers, and lessen the impact of network congestion.

The estimated WAN bandwidth savings resulting from video caching are displayed as follows:
  • On the Dashboard page, you can view the caching benefit, as a percentage, by hovering the cursor over the Data Reduction field on the Dashboard. You can also view the bytes served from the cache (Cached Data) under Aggregated Link Throughput.
    Figure 1. Viewing Caching Benefit on the Dashboard.

  • On the Monitoring > Optimization > Video Caching page, you can view the number of objects cached, and the Cache Hit Ratio (as a percentage). The bar and the time graphs display the number of requests and bytes served from cache over 1 minute, 1 hour, 1 day, 1 week, and 1 month. This data is also displayed in a tabular format below the graph.
    Figure 2. Viewing Caching Benefit on the Monitoring page

  • On the Monitoring > Optimization > Usage Graph page, you can view the cached data in the LAN Monitoring graph.
    Figure 3. Viewing Caching Benefit on the Usage Graph Page

  • On the Monitoring > Optimization > Video Caching > HTTP State List page, you can monitor the improved  cache behavior. This page reports the state of HTTP connections with respect to video caching.
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  • On the Monitoring > Optimization >Connections page, you can view the cached connections  on the Accelerated Connections tab. Both cache hits and cache misses are displayed here. The cache connections are displayed here even if they are not accelerated. That is, the cached connections are displayed here even if a partner CloudBridge appliance is not involved in the connection. 
  • Bandwidth Savings (%) column shows a bar graph of how much WAN bandwidth was saved by the transaction, whether through caching or compression. While the aim of caching and compression is to increased speed and usability and not reduced bandwidth usage, speed and usability increases are often related to bandwidth reduction. That is, a 90% bandwidth savings implies a 10x increase in speed.
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