Good time of the day, Martin.

Thank You, Martin, for Your time and answer. You wrote:

> btrace /dev/dm-0
> 
> on an otherwise idle system might help. If system is not idle
> otherwise you likely get too much output.

At random, I have found who ate the space( or one among others) - I
just catched it! :o)

> blktrace needs to be installed for this. I think I remember some knob
> in /proc or /sys which has a similar effect and you can watch I/O
> accesses in dmesg then, but I didn´t find it right now.

I will try it if there will be such need.
 
> Otherwise I like the suggestion to watch with iotop. You can run
> iotop in batch mode and output stuff to a file to inspect later (but
> be careful about free space on / :).

Oh! I even did not guess it has such ability! Thank You!
 
> I´d strongly suggest more than 100 MiB free space on /.
> 
> Usually its good to leave at least 10-20% of the filesystem free to
> avoid fragmentation.

And that makes 10-20% extra money spending on HDD purchase. :o)


Sthu.


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