When collecting a high amount of data, or if you drives are not large enough as per the NFA System Requirements your drive may fill up to 90%.
The CA NFA Data Retention Service on each Harvester is set by default to always maintain 10% free disk space.
The default Watchdog settings is set to warn about disk utilization when you are over 80%.
As long as the CA NFA Data Retention Service and the CA NFA Reaper service are running, you should not be concerned if NFA is is warning about 90% disk utilization.
To work around the warning messages you have several options.
1. Increase the disk space to meet the NFA System Requirements.
2. Go to Administration->Watchdog Settings and set the "Disk Threshold" to over 95%, click save and recycle the "Netqos ReporterAnalyzer Watchdog Service".
3. You can change the freeSpacePercentage setting in the data_retention database by running:
update settings set value=20 where name='freeSpacePercentage';
Then recycle the CA NFA Data Retention Service
The example above would make sure the harvester does not go over 80% free space.