Unix df not updating
To find deleted files but are still in use by some process Additionally to what have been explained, the issue could be that there is a another mount point of the deleted file directory on another attached disk device on the same server.
df displays the amount of disk space available on the file system containing each file name argument.
If you have data written to the drive and mount another filesystem over it, linux correctly notes the disk usage even though you can't see the files under the mount point.
If you have nfs mounts, try umounting them and looking to see if anything was accidentally written in those directories before the mount.
In this case either restart a process that is using the file or nullify the file.
In case of application processes, you can refer application guides how to stop, start, restart its processes.You will find Free Disk Space Applet located under GUI menus.Here is a sample from Fedora Linux version 22 system: The author is the creator of nix Craft and a seasoned sysadmin, Dev Ops engineer, and a trainer for the Linux operating system/Unix shell scripting.Then you cd into the problem child and repeat the process for all items in it.To make this easy to spot the large items, we change the du slightly and couple it with a sort.