I have noticed that some virtual machines does not contain vmware.log files. I need to find the root cause of it.

There's been an issue with growing log files (up to several GB), especially for Windows Terminal-Servers. This often caused disk space issues on the datastores.

Maybe this happened in the past, and someone disabled logging for such VMs (VM settings -> Options -> General).

You can use the following command to list the VMs with their current setting.

Get-VM |  %{$M = Get-View $_ ;  Write-Host $M.Name " - " $M.Config.Flags.EnableLogging}

André