Writes fail despite disk space
An upload-processing service starts failing with 'No space left on device' when writing temp files, but `df -h` shows the data volume is only 47% full. Writes are erroring across the whole fleet on the same mount. `df -i` shows inode usage at 100%. The directory that holds per-job scratch files has tens of millions of tiny files, and a cleanup cron that used to delete finished jobs' scratch dirs was disabled in a refactor two weeks ago. How do you triage this confusing 'disk full but not full' symptom and recover?
What a strong answer looks like
Stop the bleeding first (mitigate), then form hypotheses from real signals. Separate root cause from symptom, communicate status as you go, and close with what prevents a repeat.
0:00 of about 30 min
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.