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Check inode usage of filesystems

harmlessFilesystemalle
user@server
df -ih -x tmpfs -x devtmpfs -x squashfs

Every file uses one inode, and on ext4 their number is fixed when the filesystem is created. When IUse% reaches 100 percent, no new files can be created, even if gigabytes are still free. Typical causes are millions of small files, such as PHP sessions, cache files or a full mail queue.

Note: XFS and Btrfs allocate inodes dynamically, so the problem is rare there.

Also searched as

  • no space left on device but disk not full
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  • show inode usage

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Show free disk space on all filesystems

$df -hT -x tmpfs -x devtmpfs -x squashfs
harmlessFilesystem

Analyze disk usage interactively with ncdu

$ncdu -x /var
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Calculate the total size of all files of one type

$find /var/www/vhosts/example.com/httpdocs/wp-content/uploads -type f -iname '*.mp4' -printf '%s\n' | awk '{s+=$1; n++} END {printf "%d Dateien, %.1f MB\n", n, s/1048576}'
harmlessFilesystem

Empty a file without deleting it

$truncate -s 0 -- /var/www/vhosts/example.com/logs/error_log
destructiveFilesystem

Find deleted files still held open

#lsof -nP +L1
harmlessFilesystem

Find directories with the most files

$du --inodes -x -d 1 /var/www/vhosts 2>/dev/null | sort -rn | head -20
harmlessFilesystem

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