So, few months down the line and my instance is running out of inodes again (see http://www.webpagetest.org/forums/showthread.php?tid=13204).
All my tests are archived to S3, so the obvious thing to do is to on a regular basis delete old tests which can then be retrieved from S3.
However, I’m unclear as to how to delete tests, but still have them appear in the Test History - that is, remove the test data (which can be fetched from S3) to free up space/inodes, but keep the “index” to the test on the server.
Anyone the right set of files etc. to remove to do this?