Portal logs are created in default location even though the different location is configured in VMOPTIONS with the below property in PortalServive.vmoptions
The same property is working fine for all other logs.
Corrupted PortaService.vmoptions caused the issue.
Release : 10.x
Component : CA Service Virtualization
Creating a new PortalService.vmoptions from the other working VMOPTIONS should resolve the issue. For example, if registry.log is created in the path /Test/CA/DevTest10.5/LisaTempLogs10.5/ then open RegistryService.vmoptions file and saved it as PortalService.vmoptions file. Then make any other configuration changes if needed for the PortalService.vmoptions and save it. Then restarted PortalService and the logs should be seen in the /Test/CA/DevTest10.5/LisaTempLogs10.5/ instead of it in the default folder.