Sizing Real User Analyzer instances

The Real User Analyzer component is sized according to the following table:

Real User Analyzer sizes

Size

Processor

Memory

Disk (recommended)

Expected volume of traffic
Demo mode2 vCPU4 GB20 GBNA for Demo mode
Small

2 vCPU

8 GB

100 GB

900 to 2,000 hits per second

Medium

4 vCPU

16 GB

570 GB

1,500 to 3,500 hits per second

Large

8 vCPU

32 GB

570 GB

2,500 to 7,500 hits per second

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 the Collector instances that are feeding it and check the sampling rate, as shown in the following example page.

Real User Collector Home page

The sampling rate represents the number of hits per second that are being discarded because the target Analyzer cannot accommodate the load, causing the Analyzer 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.

Note

To "rebuild" pages and sessions, an Analyzer instance uses memory caches, the size of which determines how many simultaneous page requests and simultaneously active users that the system can track.

Related Topics

Sizing Real User Collector instances

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Comments

  1. Scott Field

    On linux is the storage space in the /opt/bmc file system or is it some other. We are assuming /opt/bmc but the space could conceivably go somewhere like /var for instance.

    Jan 16, 2020 08:35
    1. Harihara Subramanian

      Hello Scott Field,

      All our components are installed at the /opt/bmc directory. /var/tmp in Linux is usually marked as a temporary directory. So you before installing you need to have enough space for /opt/bmc.

      CCing Vinay Deshmukh to confirm.

      Jun 02, 2020 03:56
      1. Harihara Subramanian

        Hi Scott Field,

        Here is a response from our SME (Harel Yaakov).

        /opt/bmc is the default install directory but the user can change it at the install time. In that case, it will be in the installation directory that was selected by the user.

        Thanks,

        Hari

        Jun 09, 2020 12:00