Quantellium saves time-series SNMP data (collected through sDCs), to Round Robin Databases (RRDs) and uses RRDTool to build graphs of data stored in RRDs. The main advantage of an RRD is that its size always remains constant, whereas in linear databases, the size of the database increases as new data is always appended at the bottom of the table. Quantellium keeps collected data up until one year in the database.
Run on demand vs Run always
For performance reasons, sDCs that have a Polling Interval (PI) < 60 seconds do not run in background but will run instantly on demand. The short PI makes them ideal for “Real-time” monitoring, hence their name (Real-time sDCs)! sDCs with a PI >= 60 seconds are always running (in background).
To view a Real-time graph, double-click on a device icon on a map or select a device from the Devices list and click on one of the available “Real-time SNMP Data Collectors”. The sDC is launched instantly and should show its first results after a while.
To view the graph of an sDC with a PI >= 60 seconds, select Data collectors | Running from Quantellium’s left menu and click on one of the available “sdcLive” URL’s (60 samples, Day, Week, Month, Year). You can also double-click on a device icon on a map to open its detail page. The running graphs are shown under the “Real-time SNMP Data collectors pane”.
The line of text on just above the graph, provides access to the sDC configuration file, the sample-interval and the raw graph data. The listbox under the graph allows you to add the current graph (and its customizations) to a dashboard. The date picker at the bottom of the graph can be used to select “a single date” or “a date range”. The date-picker will pop-up if you click the input field.
Graphs can be slightly customized by using the controls on the second tab (“Customize”). On this tab you’ll find controls that allows you to enable or disable series, define series labels, types and colors. You can also define the graph title and y-axis. Below a screenshot of a customization page.
Don’t forget to save your settings! Your new settings will be used each time you open the same graph.