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Forum Discussion
System volume root usage (/dev/md0) at 100%
I have recently began getting the error message in logs “Volume: System volume root's usage is 100%. This condition should not occur under normal conditions. Contact technical support.”
Some searching in the forums has lead me to use some basic command line tools to search for the problem.
Looking at disk space:
root@TXHReadyNAS:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 10M 4.0K 10M 1% /dev
/dev/md0 3.7G 3.7G 0 100% /
tmpfs 1009M 8.0K 1009M 1% /dev/shm
tmpfs 1009M 432K 1009M 1% /run
tmpfs 505M 996K 504M 1% /run/lock
tmpfs 1009M 0 1009M 0% /sys/fs/cgroup
/dev/md127 1.9T 730G 1.2T 40% /data
/dev/md127 1.9T 730G 1.2T 40% /apps
/dev/md127 1.9T 730G 1.2T 40% /home
It appears that the problem is /dev/md0 being at 100% usage.
Searching for large files:
root@TXHReadyNAS:~# cd //
root@TXHReadyNAS://#
root@TXHReadyNAS://# du -hsx * | sort -rh | head -10
du: cannot access 'proc/15544/task/15544/fd/3': No such file or directory
du: cannot access 'proc/15544/task/15544/fdinfo/3': No such file or directory
du: cannot access 'proc/15544/fd/3': No such file or directory
du: cannot access 'proc/15544/fdinfo/3': No such file or directory
948M apps
323M var
196M usr
30M lib
30M frontview
16M chunk-stream0-00821.m4s
16M chunk-stream0-00689.m4s
16M chunk-stream0-00601.m4s
16M chunk-stream0-00466.m4s
15M chunk-stream0-00833.m4s
With apps being the largest directory I searched there too:
root@TXHReadyNAS://# cd apps
root@TXHReadyNAS://apps# du -hsx * | sort -rh | head -10
828M plexmediaserver-annapurna
68K transmissionr6
0 DO_NOT_DELETE
I’m not sure that the second part was anything to be alarmed by, but I don’t have much experience with command line tools so can’t go much further on my own.
Logs are also warning me that my Volume data is degraded. I thought I would approach the root usage problem first but felt this might be worth mentioning.
I’m using
Model: ReadyNAS 202
Firmware: 6.9.5
I have everything backed up onto external storage so am ready to go.
Would really appreciate if anyone could help.
4 Replies
tommyhackett wrote:
16M chunk-stream0-00821.m4s
16M chunk-stream0-00689.m4s
16M chunk-stream0-00601.m4s
16M chunk-stream0-00466.m4s
15M chunk-stream0-00833.m4s
Delete all of these chunk files. They are remnants of plex real-time transcoding - they really shouldn't be writing them to the root, but that's something to take up with the plex folks.
Are there more of these? The four in your post don't account for all of the space use (only ~80 MB of it).
tommyhackett wrote:
root@TXHReadyNAS://# du -hsx * | sort -rh | head -10
du: cannot access 'proc/15544/task/15544/fd/3': No such file or directory
du: cannot access 'proc/15544/task/15544/fdinfo/3': No such file or directory
du: cannot access 'proc/15544/fd/3': No such file or directory
du: cannot access 'proc/15544/fdinfo/3': No such file or directory
948M apps
apps is actually a mount point to the data volume, so it isn't part of the problem here. The "du" errors are also related to mount points.
It's best to remount the root volume, and search that - it avoids these issues, and can uncover space usage that is hidden underneath mount points. It's also much faster.
So start by entering
mount --bind / /mnt
That mounts sysroot as /mnt.
Then analyze space on /mnt
When done, you unmount it with
cd / umount /mnt
The cd matters, the umount will fail if you are in a folder of /mnt.
Hi, thanks for the response. I did a little more searching just after I made the post and think I'm in a good place now.
You're right, there were more of the chunk files (1461 written to the root!) and removing them appears to have solved my problem.
After doing that, I think I'm ok with root looking like:
root@TXHReadyNAS:~# cd /
root@TXHReadyNAS:/# ls -1
1
apps
bin
boot
data
dev
etc
frontview
home
init-stream0.m4s
init-stream1.m4s
lib
lost+found
media
mnt
opt
proc
root
run
sbin
selinux
srv
sys
tmp
usr
var
root@TXHReadyNAS:/# df -h
Filesystem Size Used Avail Use% Mounted on
udev 10M 4.0K 10M 1% /dev
/dev/md0 3.7G 649M 2.9G 19% /
tmpfs 1009M 8.0K 1009M 1% /dev/shm
tmpfs 1009M 468K 1009M 1% /run
tmpfs 505M 1000K 504M 1% /run/lock
tmpfs 1009M 0 1009M 0% /sys/fs/cgroup
/dev/md127 1.9T 729G 1.2T 40% /data
/dev/md127 1.9T 729G 1.2T 40% /home
/dev/md127 1.9T 729G 1.2T 40% /apps
I'm really not sure what could have caused Plex to behave this way initially, perhaps I did something wrong when installing/updating it some time. Any way, I have removed and reinstalled Plex using the GUI. No signs yet that it is writing unwanted stuff to the root again, but I will have to keep an eye on it I guess.
You should probably remove these two also, as they were also left there by plex.
init-stream0.m4s init-stream1.m4s
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