Resolution: When you start TIBCO Business Events RMS server, it creates HTTP temp files in /tmp folder. This is expected behavior. RMS creates temporary files in the /tmp directory.
Some temp files (Java temp) are created by RMS (httpRoot folder). The files created in the default temp directory (/tmp) can be modified to different directories by adding the following property to the be-rms.tra file.
java.property.java.io.tmpdir=<tempDir>