User's Guide

Data Collection Overview
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Data from network flows is collected in an aggregated form for a period of time
(called a collection interval), and then stored in the Extreme Management Center
database. Extreme Management Center uses this data to provide reports that
show how your network is being utilized.
To conserve space on your Extreme Management Center server hard drive, your
ExtremeAnalytics engines only collect total flow records when the server hard
drive drops below 10 GBof free space. If the Extreme Management Center server
hard drive drops an additional 1 GB (under 9 GBof free space), your
ExtremeAnalytics engines stop collecting all flow data.
NOTE: To change the differential threshold (the additional amount of free space reduction after which
all records stop being collected), edit the RM_FREE_SPACE_MINIMUM_ALLOW_SUMMARY_
KB value in the NSJBOSS.properties file. The value is set to 1,000,000 KB by default, so
ExtremeAnalytics stops collecting all records when free space reaches 10GB - 1,000,000 KB = 9
GB.
Collection Targets
Flow data is collected on objects in your network called targets. Some targets
are physical, such as clients and servers, and some are logical, such as
applications.
An ExtremeAnalytics engine can track the following target types:
l Client — The end-point of a flow that has the client role for that connection.
l Server — The end-point of a flow that has the server role for that connection.
l Application — An application in ExtremeAnalytics, identified through layer 7
analysis (for example, Facebook).
l Application Group — Application categories, such as Cloud Computing or Social
Networking.
l Site — The client's physical location on the network, based on its IP address. Sites
are used by ExtremeAnalytics to identify the physical location for the client of an
application flow.
l Device Family — The kind of device determined for a client, such as Windows or iOS.
l Profile — An ExtremeControl profile assigned to a client.
In some cases, the engine can also track combinations of targets. For example, it
can track the total number of bytes transferred from Workstation 1 for the Payroll