Recently, we were doing load testing of an enterprise application. We use VisualStudio load testing project now known as Azure DevOps with 4 agents having 16 cores, 64GB each. Due to some enterprise restrictions we are not able to use the VSO / DevOps hosted agents instead we have to use 'bring your own agent' method. It was fine when we were below 3000 virtual users limit. But when we targeted 5000 users, we ended up in load test agent issues than the application.
One of the issues was a failure in load test run saying there was not enough hard disk space. When I went into the machine using my login, I could see the "This PC" page shows the c:\ drive is full. But when I select all folders inside c:\ and check the properties, it doesn't shows the same disk usage!!!
Which folder is filled up? Any magic going on here?
It was interesting as the properties shows low usage where drive shows full even I am admin in the load agent machine.
Fortunately, we have Microsoft support and they were in the meeting. They pointed out to windirstat tool which shows where the files and who use the space in reality.
It was the temp folder of the user who runs the VSTS load test agent service. The location is below which is filled by the load test runs.
C:\Users\<user who runs the VSTS load test service>\AppData\Local\Temp\
It seems many people faced the same drive and folder size mismatch in different scenarios. Some experiences are here and here.
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