I followed Wordpress - Wordpress Multisite + FastCGI_Cache + Pagespeed + Cloudflare | Centmin Mod Community to setup my WordPress sites, Multisite, and caching. The problem is that my server is filling its hard drive with junk extremely quickly, and it crashes after a few hours. It looks like about 1–2 GB per hour are being generated by something—probably the caching. What's happening? Any idea what I can do to prevent this, or at least track it down? I do have a big database, but that's not inflating itself. I run a find command and only find my expected large files. A complete server reboot (not just service restarts for Nginx, PHP-FPM, and MySQL) does clear whatever is filling up. Please help!