Arch Linux

Stephen2

Member

Registered: 2012-03-21

Posts: 6

[SOLVED] df showing disk very full, but ncdu shows much less used?

Hi, thanks for helping me understand this.

Filesystem                      Size  Used Avail Use% Mounted on
dev                             3.9G     0  3.9G   0% /dev
run                             3.9G  1.3M  3.9G   1% /run
/dev/sda3                       154G  132G   15G  91% /
tmpfs                           3.9G   12K  3.9G   1% /dev/shm
tmpfs                           3.9G     0  3.9G   0% /sys/fs/cgroup
//freenas.pittman.local/public  9.9T  5.6T  4.4T  57% /mnt/nas
tmpfs                           3.9G  2.0M  3.9G   1% /tmp
/dev/sda1                        92M   46M   40M  54% /boot
tmpfs                           798M     0  798M   0% /run/user/1000

sda3 showing 132G used, but ncdu only shows 7G worth of stuff??

Trying to clean up some more free space

Last edited by Stephen2 (2017-07-22 17:28:29)

Slithery

Administrator

From: Norfolk, UK

Registered: 2013-12-01

Posts: 5,776

Re: [SOLVED] df showing disk very full, but ncdu shows much less used?

Unmount /mnt/nas and run ncdu again, do you get the same result?

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WorMzy

Administrator

From: Scotland

Registered: 2010-06-16

Posts: 13,723

Website

Re: [SOLVED] df showing disk very full, but ncdu shows much less used?

Alternatively, create another mountpoint for your root partition.

e.g.

# mkdir /mnt/root
# mount /dev/sda3 /mnt/root
# ncdu /mnt/root

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Stephen2

Member

Registered: 2012-03-21

Posts: 6

Re: [SOLVED] df showing disk very full, but ncdu shows much less used?

Thanks very much.

These suggestions made it clear what was wrong.  The "/mnt/nas" had failed to mount at some point, and software had written files into the filesystem inside this folder, instead of to the NAS

Should be an easy fix now.

x33a

Forum Fellow

Registered: 2009-08-15

Posts: 4,587

Re: [SOLVED] df showing disk very full, but ncdu shows much less used?

This has happened to me with a backup script once. Now I always make sure that the destination is a mount point. Anyway, please mark the thread as solved.