Glossary term
What is inode? Meaning for developers
The record that holds a file's details; a file system has a fixed number of them, so it can be full while df -h shows free space.
Learn it properly · Linux & ShellLesson 7: Disks, Memory, Logs and Troubleshooting a Slow Serverdf, du, free, load average, iostat-style tools, reading logs, and a step-by-step method for a slow or full server.