Agents Administration - Tests
 

Default Parameters for WVDDiskActivityTest

This test reports statistics pertaining to the input/output utilization of each physical disk on the chosen User/Desktop.

This page depicts the default parameters that need to be configured for the WVDDiskActivityTest test.

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

  • The Disks parameter lets you to choose the type of disks that you want to monitor. By default, Physical will be selected from the Disks list box indicating that this test will monitor the physical disks in the chosen Azure virtual desktop. However, you can override this setting as per your requirement. If you want to monitor the logical disks on the virtual desktop, choose Logical from the Disks list box. Likewise, selecting All from the list box will help you to monitor both physical and logical disks on the selected Azure virtual desktop.

  • Setting the UseExe flag to true, ensures that the disk activity metrics are collected by executing a binary instead of dynamically linking to the Performance instrumentation library. By default, this is set to false.

  • By default, the Trace flag is set to No. This indicates that, by default, the detailed diagnosis of the test provides only high-level insights into the I/O load imposed on a disk partition in a virtual desktop. These default insights help administrators identify the I/O-intensive applications running on a virtual desktop, but they do not pinpoint the precise file that experienced the maximum reads/writes. For granular, file-level insights into I/O load and usage, you need to set the Trace flag to Yes.

    Note:

    Setting the Trace flag to Yes will cause eG Enterprise to collect and store read/write metrics pertaining to every file stored in the disk partition. This can increase the strain on the eG database. Therefore, it is recommended that you turn on the Trace flag only after ensuring that the eG database is well-sized and well-tuned.

  • The Read Size in KB parameter is applicable only when the Trace flag is set to Yes and the Disk Busy measure violates the value specified against the “Disk Busy Percent” parameter. By default, the value of this parameter is set to 10 KB. This indicates that the detailed diagnosis of this test will include the details of only those files from which data of size greater than or equal to 10 KB has been read. This setting helps you identify the files from which maximum data was read. However, you can override the default value of this parameter as per your requirement.

  • The Write Size in KB parameter is applicable only when the Trace flag is set to Yes and the Disk Busy measure violates the value specified against the “Disk Busy Percent” parameter. By default, the value of this parameter is set to 10 KB. This indicates that the detailed diagnosis of this test will include the details of only those files to which data of size greater than or equal to 10 KB has been written. This setting will help you to identify the files to which maximum amount of data was written. However, you can override the default value of this parameter as per your requirement.

  • The Disk Response Time Secs parameter is applicable only when the Trace flag is set to Yes and the Disk Busy measure violates the value specified against the “Disk Busy Percent” parameter. By default, the value of this parameter is set to 1 second. This indicates that the detailed diagnosis of this test will include the details of only those files that took longer than 1 second to read and write data of size specified against the Read Size in KB and Write Size in KB parameters. This setting will help you to identify the files that took the maximum time to respond to read/write requests. However, you can override the default value of this parameter as per your requirement.

  • The Event Capture Interval in Secs parameter is applicable only when the Trace flag is set to Yes and the Disk Busy measure violates the value specified against the “Disk Busy Percent” parameter. By default, the value of this parameter is set to 10 seconds. This setting ensures that the detailed diagnosis of the test reports on only those disk events that were performed during the last 10 seconds of a measurement period. However, you can override the default value of this parameter as per your requirement.

    Also, the detailed diagnosis of this test will report on only those files that fulfill all the following criteria:

    • The files involved in the disk events captured during the interval specified against Event Capture Interval in Secs;
    • The size of the data read from/written to the files is greater than or equal to the values specified against Read Size in KB and Write Size in KB.

      (OR)

      The responsiveness of the files to I/O requests is greater than or equal to the value specified against the Disk Response Time Secs parameter.

  • The Disk Busy Percent parameter is applicable only when the Trace flag is set to Yes. Specify the percentage of time beyond which the disk partition should be in use for this test to report detailed diagnosis for the Disk Busy measure. By default, this parameter is set to 20. This means that, by default, the Disk Busy measure of this test will report detailed diagnostics only for those disk partitions that have been busy for more than 20% of the time. You can override this value as per your requirement.

  • Once the above values are provided, click on the UPDATE button to register the changes made.

When changing default configurations of tests, the values with “$” indicate variables that will be replaced by the eG system according to the specific server being managed - for instance, $hostName is the host/nickname of the target host, $port is the port number of the server being monitored. E.g., for a server xyz:80, $hostName will be changed automatically by the eG manager to “xyz*” and $port will be changed to “80” when configuring a test.