ReadyNAS Ultra 6 /dev/md0 is 100%

Ultra:/# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/md0              4.0G  4.0G     0 100% /
tmpfs                  16K     0   16K   0% /USB
/dev/c/c              8.2T  7.9T  343G  96% /c

Ultra:/# df -i
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/md0               65536   14908   50628   23% /
tmpfs                 126599       1  126598    1% /USB
/dev/c/c             137052160  413633 136638527    1% /c

Ultra:/# ls -lah /
total 100K
drwxr-xr-x  23 root  root  4.0K 2014-10-20 23:07 .
drwxr-xr-x  23 root  root  4.0K 2014-10-20 23:07 ..
-rw-r--r--   1 root  root     0 2010-11-19 06:43 0
lrwxrwxrwx   1 root  root    16 2012-04-27 11:27 addons-config -> /c/addons-config
lrwxrwxrwx   1 root  root    17 2011-08-13 16:37 addons-scripts -> /c/addons-scripts
lrwxrwxrwx   1 root  root     9 2010-11-18 23:16 backup -> /c/backup
drwxr-xr-x   2 root  root  4.0K 2013-07-22 19:15 bin
drwxrwxrwx  19 root  root  4.0K 2014-06-18 11:45 c
drwxr-xr-x  17 root  root  4.3K 2014-08-10 16:07 dev
drwxr-xr-x  66 root  root  4.0K 2014-08-10 16:23 etc
-rw-r--r--   1 root  root   385 2012-10-04 17:45 FixBackup.sh
-rw-r--r--   1 root  root    66 2013-01-29 16:57 FixTorrent.sh
drwxr-xr-x   6 admin admin 4.0K 2009-10-03 09:15 frontview
drwxr-xr-x   3 root  root  4.0K 2008-03-12 11:56 home
-rw-r--r--   1 root  root    97 2010-11-19 06:43 hwm.log
drwxr-xr-x   2 root  root  4.0K 2007-09-08 03:53 initrd
drwxr-xr-x  14 root  root  4.0K 2013-07-22 19:15 lib
drwxr-xr-x   2 root  root  4.0K 2013-07-22 19:15 lib64
drwx------   2 root  root   16K 2010-11-18 23:06 lost+found
lrwxrwxrwx   1 root  root     8 2010-11-18 23:16 media -> /c/media
drwxr-xr-x   2 root  root  4.0K 2006-10-29 00:06 mnt
drwxr-xr-x   5 root  root  4.0K 2014-01-26 22:30 opt
lrwxrwxrwx   1 root  root     8 2011-06-23 02:25 Other -> /c/Other
dr-xr-xr-x 122 root  root     0 2014-08-10 16:05 proc
drwxrwxrwt   2 root  root     0 2014-10-22 21:48 ramfs
-rw-------   1 root  root  1.0K 2014-06-27 14:12 .rnd
drwxr-xr-x   3 root  root  4.0K 2014-08-10 16:06 root
drwxr-xr-x   2 root  root  4.0K 2013-07-22 19:15 sbin
lrwxrwxrwx   1 root  root    11 2011-02-19 07:13 software -> /c/software
drwxr-xr-x  12 root  root     0 2014-08-10 16:05 sys
lrwxrwxrwx   1 root  root     8 2012-01-15 23:51 Taryn -> /c/Taryn
drwxrwxrwt   4 root  root  4.0K 2014-10-21 22:52 tmp
-rw-r--r--   1 root  root     0 2014-06-17 15:52 .update_success
drwxrwxrwt   2 root  root    40 2014-08-10 16:06 USB
drwxr-xr-x  11 root  root  4.0K 2014-02-28 11:53 usr
drwxr-xr-x  15 root  root  4.0K 2014-02-28 11:53 var
lrwxrwxrwx   1 root  root    10 2012-04-27 11:27 webroot -> /c/webroot
lrwxrwxrwx   1 root  root    10 2012-08-08 01:18 Website -> /c/Website
lrwxrwxrwx   1 root  root     7 2012-08-15 23:22 xbmc -> /c/xbmc