root partition full

[Marius Gedminas]

On Tue, Dec 20, 2011 at 04:16:06PM -0600, CJ Tres wrote:
> On 12/20/2011 02:09 PM, Colin Law wrote:
> >On 20 December 2011 17:32, CJ Tres<ctres at grics.net>  wrote:
> >>I've followed the guide at http://ubuntuforums.org/showthread.php?t=1122670
> >>
> >>Unmounting all but system partitions,
> >>I've run apt-get-clean and -autoclean along with --autoremove, emptied trash
> >>in root and home and after I removed old kernels and headers I've reduced /
> >>by 4%.
> >>There are no large or numerous log files, although I did delete the oldest
> >>ones in each group.
> >>
> >>I did install doodle yesterday, which created a 20G directory in /var/lib.
> >>As an experiment I moved that folder to another hd but the size of / wasn't
> >>reduced, it's still 96% full! - 28G total 26G used 1.1G available. When I
> >>tried to put it back there wasn't enough room.
> >>Remaining directories are at or<  1%.
> >>
> >>Analyzing the file system with disk usage analyzer (gksudo boabab) still
> >>reports root as 100% full (after doing the above steps) and the size as
> >>13.5G, home as 62.3% full - 8.4G, /usr as 27.5% at 3.7G and /var - 4,5% -
> >>617.1 MB.
> >>
> >>  df -Th | sort says:
> >>/dev/sda1     ext3     28G   26G  1.1G  96% /
> >>/dev/sda7     ext4     51G   13G   36G  27% /home
> >>Filesystem    Type    Size  Used Avail Use% Mounted on
> >>none      devtmpfs    4.0G  704K  4.0G   1% /dev
> >>none         tmpfs    4.0G     0  4.0G   0% /var/lock
> >>none         tmpfs    4.0G  432K  4.0G   1% /var/run
> >>none         tmpfs    4.0G  788K  4.0G   1% /dev/shm
> >>
> >>Is there something else I'm missing that I may be able to do to get the
> >>percentage down or is my / partition just too small?
> >
> >Looking again at those they do not make sense.  df is showing / as 28G
> >but you say baobab shows it as 13.5G.  Are you sure you are reading
> >the baobab display correctly?  If you hover over the icons one will
> >say Scan Filesystem.  Click that and it will scan the whole lot (go
> >and have a cup of coffee) and show you where the space is used.
> >
> >Colin
> 
> I believe that's what I did.
> Here's a screenshot.
> http://imagepaste.nullnetwork.net/viewimage.php?id=2960

Did you run baobab as root (with gksudo)?  Perhaps it skipped some
inaccessible directories in, say, /var, and thus couldn't count their
sizes properly?

I'm not a fan of baobab.  I like du:

  sudo du -xhs /

does this print a number close to those 26G that df claims?

If not, most likely there are deleted files kept open that occupy space.
Check with

  sudo lsof / | grep '(deleted)'

Worst case, there's some filesystem corruption that makes the free block
count disagree with the real amount.  But I think that's unlikely.
(Running fsck would fix that; you can't run fsck on mounted filesystems;
you can't unmount /, so touch /forcefsck to force a full filesystem
check on next boot, then reboot.  If you think unnoticed fs corruption
might be the case.  Which is unlikely.)

Marius Gedminas
-- 
Any time somebody tells you that you shouldn't do something because it's
"unprofessional," you know that they've run out of real arguments.
		-- Joel Spolski
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