disk-usage

name: disk-usage description: Analyze disk space usage, filesystem mounts, and storage allocation on Linux systems. Identifies large files and directories, checks partition usage, and reports inode consumption. Use when the user asks about disk full errors, free space, storage usage, du/df output, finding large files, or checking which directories consume the most space.

Disk Usage Skill

Analyzes disk space and filesystem usage on Linux systems.

Suggested Workflow

1. Run ./scripts/diskinfo.sh for a structured overview of mounts, block devices, and top directories.
2. Check df -h output for any filesystem above 80% usage.
3. Drill into high-usage mounts with du -h --max-depth=1 /mount to find large subdirectories.
4. Locate specific large files with find /path -type f -size +100M.

Commands Reference

Filesystem Overview

• df -h - Disk space usage for all mounted filesystems (human-readable)
• df -i - Inode usage (number of files)
• lsblk - Block device tree (disks, partitions)
• mount - Currently mounted filesystems

Directory Size Analysis

• du -sh /path - Total size of a directory
• du -h --max-depth=1 /path - Size of immediate subdirectories
• du -ah /path | sort -rh | head -20 - Largest files/directories

Finding Large Files

• find /path -type f -size +100M - Files larger than 100MB
• find /path -type f -size +1G - Files larger than 1GB
• ls -lhS /path | head -20 - List files sorted by size (largest first)

Disk Information

• cat /proc/partitions - Partition table
• cat /proc/mounts - Mount information
• stat -f /path - Filesystem statistics

Tips

• Always use -h for human-readable sizes
• The du command can be slow on large directories; use --max-depth=1 to limit recursion
• Root filesystem (/) usage above 90% may cause issues