Disk Usage Test

The software-only components of the Cisco SD-WAN appliance run as a separate VM on servers. These components are therefore allocated with resources such as CPU, Disk and Memory. If any component is running out of disk space or if the disk allocated to that component is disabled, then, there would be an unprecedented interruption in the functioning of those components. To avoid such unwanted interruptions, administrators should be intimated of the disabled disk and space crunch promptly. This will help administrators enable the disk and enhance the disk space allocated to the components well before service levels start taking a turn for the worse!

This test periodically checks the status of each disk allocated to the component and the disk space usage. This test proactively alerts administrators to potential disk space contentions. This would help administrators amend issues before performance of the component deteriorates.

Target of the test : Cisco SD-WAN

Agent deploying the test : An external agent

Outputs of the test : One set of the results for each component of the target Cisco SD-WAN being monitored

Configurable parameters for the test
Parameter Description

Test period

How often should the test be executed


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


Specify the port at which the specified Host listens to. By default, this is NULL.


By default, the eG agent executes REST APIs on the target appliance to collect the required metrics. For the eG agent to execute the REST APIs, a special user with monitoring privilege is required. Specify the name of such a user in this text box.


Specify the password corresponding to the user mentioned in the Username text box here.

Confirm Password

Confirm the Password by retyping it here.


By default, the REST API Port is set to none. This implies that by default, this test connects to the default port to execute the REST API commands and collect the required metrics. In some environments however, a different port can be used to execute the REST API commands. In such case, specify that port number against the REST API Port text box.


The eG agent collects performance metrics by executing REST APIs on the target appliance. Typically, the REST APIs can be invoked through HTTP or HTTPS mode. By default, the eG agent invokes REST APIs using the HTTPS mode. This is why, the SSL flag is set to Yes by default. If the target appliance is not SSL-enabled, then the REST APIs can be accessed through HTTP mode only. In this case, set the SSL flag to No.

Measurements made by the test
Measurement Description Measurement Unit Interpretation


Indicates the current status of the disk allocated to this component.


The measure values that this test can report and their corresponding numeric values are listed in the table below:

Measure Value Numeric Value
Disabled 0
Enabled 1


By default, this measure reports the above-mentioned values to indicate the current status of disk for each component. The graph of this measure however is represented using the numeric equivalents i.e., 0 or 1.

Total size

Indicates the total size of disk that is allocated to this component.



Used size

Indicates the amount of disk space utilized by this component.


A value close to Total size measure value is a cause of concern in this case. Administrators should figure out this and add additional resources if necessary for each component.

Free size

Indicates the amount of disk space that is available for use by this component.



Disk utilization

Indicates the percentage of disk space utilized by this component.


A value close to 100 indicates that the components are facing severe space crunch. Administrators need to analyze such space constraints and add additional disk space as and when required.

Compare the value of this measure across components to identify the component that is facing potential space crunch.