I ask as I have had my nginx server online for around 2 years so far and tonight I shut it down to upgrade nginx using the centminmod script. That failed because I ran out of inodes on my VPS, turned out there is gigabytes of files in this directory.
Aside from finding out what these files actually are, I would also like to know if it is safe to prune the directory every now and again. What effect would doing this have on the actual running of site under nginx?
Any and all help on this would be appreciated.