Disk Has Space But Can't Create Files? (Linux...

One of the most confusing Linux errors I've debugged: a production server reporting "No space left on device" while df -h clearly showed 50GB free. I lost an hour to it the first time. Here's what was actually going on. I turned scenarios like this into an interactive practice tool at scenar.site - you debug simulated servers by talking to an AI interviewer. More at the end. The Setup I was on-call for a logging pipeline. Rsyslog kept crashing, and the logs were full of this: rsyslog[8421]: cann