System volume 'root' usage is 100% and /dev/md0 is full

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vandermerwe wrote:

There are other directories you can look in, there has to be something there.

Of course you do have the option of factory defaulting the nas.

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Correct.

/home, /apps, /data are actually on the data volume, so don't look in those.  But it has to be on one of the others.  Maybe try lost+found first???

I've gone through all of the directories that come up with ls.

Is there something I'm missing?

The only one I didn't check in is data because that is actually the NAS volume that stores the backup.

Here is a du -hsx of the entire root excluding data

root@RN102Backup:/# ls
apps  boot  dev  frontview  lib         media  opt   root  sbin     srv  tmp  var
bin   data  etc  home       lost+found  mnt    proc  run   selinux  sys  usr
root@RN102Backup:/# du -hsx --exclude data * | sort -rh | head -10
du: cannot access `proc/22248/task/22248/fd/4': No such file or directory
du: cannot access `proc/22248/task/22248/fdinfo/4': No such file or directory
du: cannot access `proc/22248/fd/4': No such file or directory
du: cannot access `proc/22248/fdinfo/4': No such file or directory
166M    var
130M    usr
29M     lib
24M     frontview
7.9M    sbin
5.5M    bin
5.2M    opt
4.2M    etc
1.8M    apps
324K    run

Here are the individual folders

root@RN102Backup:/# cd /
root@RN102Backup:/# ls
apps  boot  dev  frontview  lib         media  opt   root  sbin     srv  tmp  var
bin   data  etc  home       lost+found  mnt    proc  run   selinux  sys  usr

root@RN102Backup:/# cd /apps
root@RN102Backup:/apps# du -hsx * | sort -rh | head -10
0       DO_NOT_DELETE

root@RN102Backup:/apps# cd /boot
root@RN102Backup:/boot# du -hsx * | sort -rh | head -10
du: cannot access `*': No such file or directory

root@RN102Backup:/boot# cd /dev
root@RN102Backup:/dev# du -hsx * | sort -rh | head -10
4.0K    boot_reason
0       zero
0       vpd
0       urandom
0       ubi_ctrl
0       ubi0_0
0       ubi0
0       ttyS1
0       ttyS0
0       ttypf

root@RN102Backup:/dev# cd /lib
root@RN102Backup:/lib# du -hsx * | sort -rh | head -10
13M     modules
11M     arm-linux-gnueabi
3.0M    systemd
1.2M    nut
972K    xtables
780K    udev
208K    terminfo
88K     libaudit.so.0.0.0
48K     libauparse.so.0.0.0
44K     security

root@RN102Backup:/lib# cd /media
root@RN102Backup:/media# du -hsx * | sort -rh | head -10
16K     USB_FLASH_2

root@RN102Backup:/media# cd /root
root@RN102Backup:~# du -hsx * | sort -rh | head -10
du: cannot access `*': No such file or directory

root@RN102Backup:~# cd /sbin
root@RN102Backup:/sbin# du -hsx * | sort -rh | head -10
608K    ldconfig.real
480K    btrfs
464K    mdadm
264K    btrfs-convert
256K    btrfs-image
248K    mkfs.btrfs
244K    mdmon
236K    btrfs-show-super
236K    btrfs-debug-tree
232K    btrfs-zero-log

root@RN102Backup:/sbin# cd /srv
root@RN102Backup:/srv# du -hsx * | sort -rh | head -10
du: cannot access `*': No such file or directory

root@RN102Backup:/srv# cd /home
root@RN102Backup:/home# du -hsx * | sort -rh | head -10
0       admin

root@RN102Backup:/home# cd /lost+found
root@RN102Backup:/lost+found# du -hsx * | sort -rh | head -10
du: cannot access `*': No such file or directory

root@RN102Backup:/lost+found# cd /mnt
root@RN102Backup:/mnt# du -hsx * | sort -rh | head -10
du: cannot access `*': No such file or directory

root@RN102Backup:/mnt# cd /proc
root@RN102Backup:/proc# du -hsx * | sort -rh | head -10
du: cannot access `21961/task/21961/fd/3': No such file or directory
du: cannot access `21961/task/21961/fdinfo/3': No such file or directory
du: cannot access `21961/fd/3': No such file or directory
du: cannot access `21961/fdinfo/3': No such file or directory
0       zoneinfo
0       vmstat
0       vmallocinfo
0       version
0       uptime
0       tty
0       timer_list
0       sysvipc
0       sysrq-trigger
0       sys

root@RN102Backup:/proc# cd /selinux
root@RN102Backup:/selinux# du -hsx * | sort -rh | head -10
du: cannot access `*': No such file or directory
root@RN102Backup:/selinux#

root@RN102Backup:/run# du -hsx * | sort -rh | head -10
220K    udev
164K    lock
56K     readydrop
12K     systemd
8.0K    mdadm
8.0K    blkid
4.0K    utmp
4.0K    usb
4.0K    sshd.pid
4.0K    spindown

I was trying to avoid a factory reset because this NAS is the only backup of my other NAS, and I don't have any other drives to make an additional backup, and I'm not going to be without a backup, even if it is for a matter of hours.

This NAS is in RAID 1 , and it is encrypted using the built-in encryption Frontview provides. Not sure if this matters, but I figured I should note that.