TCP - VM Test

This test tracks various statistics pertaining to TCP connections to and from each guest of a Solaris LDoms server. The details of the test are provided below:

Target of the test : A Solaris LDoms server

Agent deploying the test : An internal agent

Outputs of the test : One set of results for each powered-on guest on the Solaris LDoms server being monitored.

Configurable parameters for the test
Parameter Description

Test period

How often should the test be executed

Host

The host for which the test is to be configured.

Port

The port number at which the specified host listens. By default, the port is NULL.

Domain

Specify the domain within which the virtual guests reside. Since the Solaris LDoms server supports only Solaris and Linux guests, this parameter should always be set to none.

Admin User

This test connects to each virtual guest and collects status and resource usage statistics from the guest. In order to do so, the test must be configured with user privileges that allow a remote connection to the virtual guest from the Solaris host. If a single user has access to all the guest domains on the Solaris server, specify the name of that user against Admin User, and specify his password against Admin Password. On the other hand, if the user credentials vary from one guest to another, then multiple Admin Users and Admin Passwords might have to be specified for every Solaris LDoms server being monitored.

To help administrators provide these user details quickly and easily, the eG administrative interface embeds a special configuration page. To access this page, simply click on the Click here hyperlink that appears just above the parameters of this test in the test configuration page. To know how to use the special page, refer to Configuring Users for VM Monitoring.

Admin Password

The password of the Admin User needs to be provided here. Here again, if multiple passwords need to be specified, then follow the procedure detailed in Configuring Users for VM Monitoring.

Confirm Password

Confirm the password by retyping it here. Here again, if multiple passwords need to be confirmed, then follow the procedure detailed in Configuring Users for VM Monitoring.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

Incoming connections to VM

Indicates the connections per second received by the guest.

Conns/Sec

A high value can indicate an increase in input load.

Outgoing connections to VM

Indicates the connections per second initiated by the guest.

Conns/Sec

A high value can indicate that one or more of the applications executing on the guest have started using a number of TCP connections to some other guest.

Current connections to VM

Indicates the currently established connections.

Number

A sudden increase in the number of connections established on a guest can indicate either an increase in load to one or more of the applications executing on the guest, or that one or more of the applications are experiencing a problem (e.g., a slow down).

Connection drops on VM

Indicates the rate of established TCP connections dropped from the TCP listen queue.

Conns/Sec

This value should be 0 for most of the time. Any non-zero value implies that one or more applications on the guest are under overload.

Connection failures on VM

Indicates the rate of half open TCP connections dropped from the listen queue.

Conns/Sec

This value should be 0 for most of the time. A prolonged non-zero value can indicate either that the guest is under SYN attack or that there is a problem with the network link to the guest that is resulting in connections being dropped without completion.