Oscillating space usage on dataset

[Jesper Karlsson]

I have a very strange problem on my hands, I first noticed when trying to delete a file on my 5TB dataset called /mnt/first_array/tv, but got an error saying something like 'disc quota exceeded' so I started looking into the usage of my dataset, using 'du' I got this:

du -hs /mnt/first_array/tv
2.0T /mnt/first_array/tv

and looking at the report in the freeness guy shows this:

Has anyone seen this behavior before? Or know what to do?
I'm at a complete loss at what could cause this, are there some hidden files that are generated and then removed every night?

 

[cyberjock]

Rule #1.. never do du on ZFS. It's not accurate, the numbers mean nothing because of how du internally gets its numbers. It doesn't understand ZFS, at all.

Second, I don't have a clue what is going on there. I'd start looking at what services you are using and what they are doing. Somewhere someone or something is using lots of disk space.

 

[Jesper Karlsson]

Ok, which tool could I use instead of 'du' to check the size of a file or folder on ZFS?

 

[SweetAndLow]

I bet you have some service that is trying to download something then runs out of space then fails and retries.