Inodes (index nodes) are data structures in a Unix-like file system that store essential information about files and directories. Each inode contains attributes such as the file type, permissions, timestamps, and pointers to the data blocks where the file content is stored. When a file system is created, a fixed number of inodes are allocated, limiting the maximum number of files and directories that can be stored, regardless of the available disk space.

When the table of inodes is full, the file system cannot create new files or directories, even if there is plenty of free disk space. This situation can lead to a website failure because the web server may not be able to write log files, create temporary files, or save uploaded content. As a result, the website may become unresponsive or display error messages to users. To prevent this issue, system administrators can monitor inode usage and adjust file system parameters accordingly, such as increasing the number of available inodes during file system creation or optimizing storage usage to reduce the number of files.