Sizing Analyzer or Monitor instances

The Real User Analyzer and Real User Monitor components are sized according to the following table:

Real User Analyzer sizes

^{* An additional 100 GB minimum on a secondary disk is recommended for storing traffic data. For additional information, see the Real User Analyzer storage requirements in the System requirements.}

Real User Collectors feed their data to Real User Analyzer instances, and you must size these instances to ensure that they can handle the generated load. As more Collector instances are added to the system, you must re-evaluate Analyzer capacity to ensure that the increased load is not a problem.

Sizing for traffic rate

The size that you choose to deploy depends on the volume of traffic:

• Low — 900 to 2,000 hits per second
• Medium — 1,500 to 3,500 hits per second
• High — 2,500 to 7,500 hits per second

To understand the ability of an Analyzer instance to handle the traffic load, monitor the Home page of Collector instances that are feeding it and check the sampling rate, as shown in the following example page.

Real User Collector Home page

Sampling rate represents the number of hits per second that are being discarded because the target Analyzer cannot accommodate the load, causing it to take more time than is acceptable to pull its data from the Collector.

Sizing for concurrent pages and sessions

The size that you choose to deploy might depend on the number of concurrent sessions or pages that an Analyzer instance must process:

• Low — 50,000 pages or 150,000 sessions
• Medium — 70,000 pages or 210,000 sessions
• High — 90,000 pages or 275,000 sessions

Increased traffic volume usually correlates to more users requesting more web pages. However, a given site can have a high traffic rate and a low number of users (or vice versa). So, independent of the traffic volume, you might have to adjust the resource allocation of an Analyzer instance to accommodate page- and session-tracking needs.