Managing SolarWinds UDT Polling Engines
Calculating a Baseline
Much of the raw data that SolarWinds UDT polls from monitored network objects is
provided initially as coutner values. For example, one of the values that SolarWinds
NPM polls from interfaces is ifInOctets, which returns the number of bytes the
polled interface has received since the device last booted. While this value can be
useful information in itself, generally, from a network performance monitoring
standpoint, it is more useful to know the rate of bytes received by the interface.
In order to determine a rate, two values are required. On a new install or after a
shutdown, when the SolarWinds Network Performance Monitor service starts, there is
no current network data in your Orion Platform database. In this situation, by default,
Orion calculates a baseline for the transmission rates of the various elements of your
network. To calculate this baseline, all network resources are polled immediately
upon startup, and then, as soon as the initial poll is complete, the network is polled
again. The resulting two sets of data are used to calculate a nearly instant baseline
view of your network performance.
If you do not need statistics immediately, or if you do not want SolarWinds UDT to
calculate a baseline at startup, disable baseline calculation at startup by setting the
Baseline Calculation option on the Polling Settings view to False. For more
information, see "Configuring Polling Engine Settings."
Note: Baseline calculation requires significant data gathering and processing. Until
baseline calculation is completed, both SolarWinds UDT server performance and the
CPU performance of some of network routers may be adversely affected.
Using the Polling Engine Load Balancer
The Polling Engine Load Balancer is a useful tool for reassigning nodes to a new
polling engine, deleting an unused polling engine, and performing load balancing
between multiple polling engines. The tool is available within the Monitor Polling
Engines application, which is an advanced feature of SolarWinds UDT. Reassigning
nodes to new polling engines may be required in the following situations:
n Moving or renaming your SolarWinds UDT server
n Merging two or more Servers
If these or any other conditions present the need for reassignment, complete the
following procedure to reassign nodes to a new polling engine.
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