It should be possible to configure the working directory through the "sonar.working.directory" property.
Running sonar for multiple projects at the same time gives Exception "Caused by: java.io.IOException: No space left on device""
By default the temporary ".sonar" directories should be automatically deleted by Sonar after(or before) each analysis
Configure the location of working directory
This feature used to be available on the Sonar Ant task (through the "workDir" parameter of the task) but has been removed. We introduced it again as a mean to make it easier for existing build scripts to handle the temporary directory and the way to clean it (SONARPLUGINS-1234).
Works well Fabrice and in the documentation I guess we should advice to use by convention the bin/sonar directory.