Disk space lost in home on ext3 (roughly 66% disappeared)
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Home is not 100% full - 100% of home = 77.4GB
Out of that, around 27GB is in use.
The root of any tree in those reports is always 100% because that's how it reports the maximum available space. So rinat is 77.4GB which is the maximum available space on that partition, logical volume, whatever.
That disk usage analyzer is rubbish IMHO.
Also it would be useful to know how big the disk is, and how big each LV is.
This is why I hate this tool.
I've just been trying to understand it and I've now come to the conclusion that the top figure of 100% is the product of everything under it.
So in your image, the figures only disagree by around 4GB.
But because you are not showing the root of the drive, We can't tell what else is sharing it.
df -h was saying pretty much the same - 0% available for the /home, given it's total capacity of 77GB.
However after a few reboots, the problem cleared itself up - I've got 50GB of free space now. I wish I knew what happened. Suspecting some sort of file system corruption, that was fixed by OS on startup.
I have the same problem, but on two SLES 11 SP1 installations: one uses LVM+reiserfs, and the other one, LVM+ext3. In both cases, my /home logical volumes (which are larger than 150 GB) suddenly run out of disk space ("df" reports nearly 100% of disk usage), while, by means of "du", I know there is 90 GB of free disk space at least... In any case, the space lost appears after system reboot. fschk does not report any problem.
It is strange that it always happen to /home logical volume. One could think that this problem could be related to the large amount of I/O operations this volume supports, but I have other volumes with the same I/O traffic (maybe higher) which do not suffer this problem.