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I am seeing a big constant increase in the space amount taken in the /home directory

df -h says:

Filesystem Size Used Avail Use% Mounted on /dev/md2 127G 52G 70G 43% /home

However, once I am in the /home directory, du -hs * | sort -h indicates the sum of the directories is about 20G

Therefore there is 30G of data I can't identify the origin of.

What should I look for to identify such a discrepancy between what df -h says and the actual content of the /home directory?

Edit: restarting nginx fixed the problem after using lsof | grep "/home" | grep deleted to identify what process was still using deleted files in memory

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  • I am not sure to understand what "Check for files on located under mount points" means : should I check for files size inside the /home directory?
    – Vincent
    Aug 22, 2017 at 8:36
  • /home/ is an ordinary directory on your root / file-system and like any other directory it can have subdirectories and files. When the /dev/md2 file-system is mounted on /home, then it becomes a mount point and you won't see those subdirectories and files anymore, they are hidden under the file-system of /dev/md2. But that would only be relevant if you were investigating disk usage on your root file-system.
    – HBruijn
    Aug 22, 2017 at 9:29
  • In this case: * does not match hidden directories on /home/, check for those and from the linked duplicate: check for deleted files still in use by open file descriptors with lsof
    – HBruijn
    Aug 22, 2017 at 9:32

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