Configuration of VmgTcpTrafficTest

Since most popular applications rely on the TCP protocol for their proper functioning, traffic monitoring at the TCP protocol layer can provide good indicators of the performance seen by the applications that use TCP. The most critical metric at the TCP protocol layer is the percentage of retransmissions. Since TCP uses an exponential back-off algorithm for its retransmissions, any retransmission of packets over the network (due to network congestion, noise, data link errors, etc.) can have a significant impact on the throughput seen by applications that use TCP. This test monitors the TCP protocol traffic to and from a Windows virtual desktop on the cloud, and particularly monitors retransmissions.

The default parameters associated with this test are:

• The TEST PERIOD list box helps the user to decide how often this test needs to be executed.

• In the HOST text box, specify the nick name of the Cloud Desktops component for which this test is to be configured.

• Specify the port at which the specified host listens to in the PORT text box. By default, this is NULL.

• To obtain the ‘inside view’ of performance of the cloud -hosted Windows desktops - i.e., to measure the internal performance of the Windows virtual desktops - this test uses a light -weight eGVMAgent software deployed on each of the desktops. Accordingly, Inside View Using parameter is by default set to eGVMAgent (Windows).

• Report Powered OS flag is relevant only for those tests that are mapped to the Inside View of Desktops layer. If this flag is set to Yes (which is the default setting), then the ‘inside view’ tests will report measures for even those Windows virtual desktops that do not have any users logged in currently. Such desktops will be identified by their name and not by the username_on_virtualdesktopname. On the other hand, if this flag is set to No, then this test will not report measures for those Windows virtual desktops to which no users are logged in currently.

• Report By User flag is set to Yes by default. The value of this flag cannot be changed. This implies that the virtual machines in VDI environments will always be identified using the login name of the user. In other words, in VDI environments, this test will, by default, report measures for every username_on_virtualmachinename.

• Since this test runs for a ‘Cloud Desktops’ component, Is Cloud VMs flag is set to Yes by default.

• Specify the minimum threshold for the number of segments sent/transmitted over the network in the Segments Sent Min text box. The default value is 25; in this case, the test will compute/report the Retransmit ratio from VM measure only if more than 25 segments are sent over the network – i.e., if the value of the Segments sent by VM measure crosses the value 25. On the other hand, if the Segments sent by VM measure reports a value less than 25, then the test will not compute/report the Retransmit ratio from VM measure. This is done to ensure that no false alerts are generated by the eG Enterprise system for the Retransmit ratio from VM measure. You can change this minimum threshold to any value of your choice.

• If multiple components of the same component type are awaiting configuration, then an APPLY TO OTHER COMPONENTS button will appear in this page. Clicking on this button will allow you to apply the configuration to all/selected components of that type.

• Once the necessary values have been provided, clicking on the UPDATE button will register the changes made.

When changing the configuration for specific servers, a “*” beside the text box corresponding to the parameter signifies that these values have to be manually configured by the user. The parameter values that require to be configured will typically be prefixed with a “$” or contain a series of “*”. A value of “none” in the parameter value indicates that the corresponding parameter value can be changed if required.