ClamAV uses huge amounts of resources at times, I expect when a lot of new files are uploaded. This afternoon the very high resource usage (over 10G of RAM committed when there is physically only 5G) resulted in the Linux out of memory killer taking out some processes, so I have shutdown the server, added a couple of additional CPU’s (bringing it to 4) and restarted it. Additional RAM might also be needed, or perhaps we should remove the anti-virus app?