Possible reasons why a disk partition is not added to Site24x7 for monitoring

Only the first 25 disk partitions will be added for monitoring.

Linux:

For Linux, only the local disk partitions present while executing the following command will be added:
df -l -T

Read this article to know how disk utilization is calculated for a Linux monitor.

Windows:

For Windows, the following WMI query is used to discover the disk partitions:
Select Name, Size, FreeSpace from Win32_LogicalDisk where DriveType=3

If 'No Data' is shown in the Site24x7 web client, refer this article to troubleshoot.

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