Connectivity to Virtual Desktop Test

Sometimes, a virtual desktop could be in a powered-on state, but the failure of the virtual desktop operating system or any fatal error in its operations could have rendered the desktop inaccessible to Delivery Controller, and consequently, to users. In order to enable administrators to promptly detect such ‘hidden’ anomalies, the eG agent periodically runs a connectivity check on each virtual desktop using the Desktop Connectivity Check test, and reports whether the virtual desktop is accessible over the network or not.

This test is disabled by default. To enable the test, go to the enable / disable tests page using the menu sequence : Agents -> Tests -> Enable/Disable, pick the Citrix Delivery Controller 5.x as the Component type, set Performance as the Test type, choose this test from the disabled tests list, and click on the < button to move the test to the enabled tests list. Finally, click the Update button.

Target of the test : A Citrix Delivery Controller 5.x

Agent deploying the test : An internal agent

Outputs of the test : One set of results for every virtual desktop managed by the monitored Delivery Controller.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed.

Host

The IP address of the host for which this test is to be configured.

Port

Refers to the port used by the DDC. The default port number is 80.

Report by Groupname

By default, this flag is set to Yes, indicating that this test reports a set of measures for every desktopgroup:virtualdesktop combination, by default. To ensure that this test reports a set of measures for every virtualdesktop alone, set this flag to No.

Report by Controllername

By default, this flag is set to Yes. This implies that every desktopgroup:virtualdesktop pair for which this test reports metrics will be prefixed by the controllername as well. Every descriptor will hence be of the following format by default: Controllername->desktopgroup:virtualdesktop. If you want to remove the controllername prefix from the descriptors, then, set this flag to No

ReportUnavailability

By default, this flag is set to No. This implies that, by default, the test will not report the unavailability of network connection to any virtual desktop. In other words, if the Network availability of desktopmeasure of this test registers the value 0 for any virtual desktop, then, by default, this test will not report any measure for that virtual desktop; under such circumstances, the corresponding virtual desktop name will not appear as a descriptor of this test. You can set this flag to Yes, if you want the test to report and alert you to the unavailability of the network connection to a virtual desktop. 

Packetsize

The size of packets used for the test (in bytes)

Packetcount

The number of packets to be transmitted during the test.

Timeout

How long after transmission should a packet be deemed lost (in seconds).

PacketInterval

Represents the interval (in milliseconds) between successive packet transmissions during the execution of the network test for a specific target.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

Average delay

Indicates the average delay between transmission of packet to a virtual desktop and receipt of the response to the packet at the source.

Secs

An increase in network latency could result from misconfiguration of the router(s) along the path, network congestion, retransmissions at the network, etc.

Minimum delay

The minimum time between transmission of a packet and receipt of the response back.

Secs

A significant increase in the minimum round-trip time is often a sure sign of network congestion.

Packet loss

Indicates the percentage of packets lost during transmission from source to target and back.

Percent

Packet loss is often caused by network buffer overflows at a network router or by packet corruptions over the network.

Network availability of desktop

Indicates whether the network connection is available or not.

Percent

A value of 100 indicates that the virtual desktop is connected. The value 0 indicates that the desktop is not connected.

Typically, the value 100 corresponds to a Packet loss of 0.