Strange Out of disk space
Nejc Škoberne
nejc at skoberne.net
Mon Jun 23 18:42:41 UTC 2008
Hey,
>> My guess is that something has mmap-ed a HUGE chunk of
>> disk space. If I reboot the space is freed.
>
> Much more likely is that some program has deleted a large file,
> while still holding it open. Usual suspect is some kind of log file,
> or temporary file.
I also had a similar problem, which I solved right now. :) So thanks for the inspiration
to try harder to find out what was eating my disk space. df showed this:
/dev/mirror/gm0s1f 112291390 83438178 19869902 81% /usr
and "du -d1 -k /usr" showed:
46934133 /usr
When this happened before, everything was freed after reboot.
Just now, when writing this post, I went through my process list (I wanted to compare
running services with your system) and found this:
2131 ?? DL 3:36,42 [md4]
Then I remembered that once, quite some time ago, I created a file-backed filesystem
using mdconfig. I did "mdconfig -l -u /dev/md4" and got this:
md4 vnode 111G /usr/snapshot/snap
Because /usr/snapshot/snap doesn't exist anymore (I remember deleting it one day,
because I thought I didn't need it anymore), du shows wrong size.
Then I just did "mdconfig -d -u /dev/md4" and everything is OK now:
/dev/mirror/gm0s1f 112291390 46935874 56372206 45% /usr
Hope that it maybe helps. :)
Bye,
Nejc
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