Load Evaluator Index - Cloud Test

A server’s load index may be the aggregate of:

  • Various computer performance counter based metrics, namely CPU, Memory and Disk Usage
  • Session Count

It is designed to indicate how suitable a XenApp Worker is to receive a new user session. It is the Citrix Cloud Delivery Controller's responsibility to calculate the load index based on the aggregate of the normalized load rule indexes generated by the various load rules. As only the Delivery Controller can determine the session load, a server’s overall load index is calculated on the Delivery Controller and not the Virtual Delivery Agent.

Administrators can use the Load Evaluator Index test to periodically evaluate the load on the servers managed by a delivery group. This is imperative to ensure that load is uniformly balanced across the servers. In addition, in times of an overload, this test can help administrators accurately identify which server is overloaded and which resource is the constraint.

Target of the test : A Citrix Cloud Site

Agent deploying the test : A remote agent

Outputs of the test : One set of results for every delivery group of each server OS type

First-level descriptor: Server OS type

Second-level descriptor: Delivery Group

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 at which the specified host listens to.

Report by Delivery Group

By default, this flag is set to Yes indicating that this test reports metrics for each delivery group that contains machines running a particular server OS. The delivery group-level insight into the load evaluator index enables administrators to gauge the overall load on every delivery group. If required, you can change the status of this flag to No; in this case, this test will report metrics for every server OS machine in a delivery group. The machine-level insight into load enables administrators to understand whether/not load is uniformly balanced across the different server OS machines, and accurately identify the machine that is overloaded.

Proxy Host, Proxy Port, Proxy User Name, Proxy Password, and Proxy SSL

These parameters are applicable only if the Citrix Cloud Connector communicates with the Citrix Cloud via a Proxy server.

If the Proxy server requires authentication, then specify the credentials of a valid Proxy user against the Proxy User Name and Proxy Password text boxes. Confirm that password by retyping it in the Confirm Password text box. If the Proxy server does not require authentication, then specify none against the Proxy User Name, Proxy Password, and Confirm Password text boxes.

By default, the Proxy SSL flag is set to No. If the specified proxy server is SSL-enabled, then set the Proxy SSL flag to Yes

On the other hand, if the Citrix Cloud Connector is not using a Proxy server to communicate with the Citrix Cloud, then you need not disturb the default setting of any of the Proxy-related parameters. By default, these parameters are set to none.

Detailed Diagnosis

To make diagnosis more efficient and accurate, the eG Enterprise embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option.

The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled:

  • The eG manager license should allow the detailed diagnosis capability
  • Both the normal and abnormal frequencies configured for the detailed diagnosis measures should not be 0.
Measurements made by the test
Measurement Description Measurement Unit Interpretation

Effective load evaluator index

Indicates the load evaluator index of this delivery group / machine.

Percent

By comparing the value of this measure across delivery groups / server OS machines, you can figure out whether or not load is uniformly balanced across all delivery groups / servers.

Use the detailed diagnosis of this measure to view the complete details of the machines in a delivery group and to view the CPU, disk, memory, and session load evaluator index of each machine.

CPU load evaluator index

Indicates the CPU load evaluator index of this delivery group / server OS machine.

Percent

A high value is indicative of excessive CPU usage by the delivery group / machine over time.

Memory load evaluator index

Indicates the memory load evaluator index of this delivery group / server OS machine.

Percent

A high value is indicative of excessive memory usage by the delivery group / machine over time.

Disk load evaluator index

Indicates the disk load evaluator index of this delivery group / server OS machine.

Percent

A high value is indicative of excessive disk usage by the delivery group / machine over time.

Session load evaluator index

Indicates the session count load evaluator index of this delivery group / server OS machine.

Percent

A high value indicates that the delivery group / machine has been consistently handling many user sessions.

Use the detailed diagnosis of the Effective load evaluator index measure to know which machines are in the delivery group and the CPU, disk, memory, and session load evaluator index of each machine.

Figure 1 : Detailed diagnosis of the Effective Load Evsaluator Index measure