The discoveries may fail, or the Configuration Manager may not start correctly and an error similar to the following is logged:
The nodes have a SQLite database that is used to store the information that is collected from the targets during the discovery. This information is then passed to the SQL server where the ER database is hosted.
If there is not enough free diskspace on the C: drive for the collected information to be stored in the SQLite database, the error is produced. Ensure the nodes have sufficient free diskspace.