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Solved
System volume 'root' usage is 100% and /dev/md0 is full
Hello, I recently started getting notifications that my system volume 'root' usage is 100% I've gone through all of the files and it seems the culprit is /dev/md0 I have no add-ons instal...
The reason you couldn't find it was that at some point your encrypted volume wasn't mounted (perhaps the USB key wasn't connected when you booted the NAS) and a Replicate backup job ran and filled the OS partition on the NAS.
When you looked at the system the data volume was mounted. There was data under /data on the OS partition but you couldn't tell that.
I have passed on a summary of what's happened to our engineers and am waiting for their suggestion. However as it is a long weekend in the US I don't expect a response for at least a few days.
More than likely its one or two very large files in one directory.
try
cd /var
du -hsx * | sort -rh | head -10
and if you see a directory that has gigabytes of stuff, descend into it and repeat.
If you don't pick a different main directory and try again.
/var, /etc, /usr, /opt, /frontview, /bin, /tmp are all places you can look.
Though maybe double-check /var/log first.
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