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Old 02-23-2010, 06:33 PM   #1
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Registered: Oct 2008
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Ubuntu Server incorrectly claiming disk full and persistent ureadahead/debugfs

My server is claiming a partition is full, but df and du produce conflicting results. In addition there is a /var/lib/ureadahead/debugfs "partition" that seems to be mirroring the "full" partition. What is going on here and how to resolve? First the data...
uname -a yields:
Linux eRuiServer 2.6.31-19-generic-pae #56-Ubuntu SMP Thu Jan 28 02:29:51 UTC 2010 i686 GNU/Linux

status ureadahead yields:
ureadahead stop/waiting

df yields:
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 24027628 22204940 602152 98% /
udev 253720 208 253512 1% /dev
none 253720 124 253596 1% /dev/shm
none 253720 532 253188 1% /var/run
none 253720 0 253720 0% /var/lock
none 253720 0 253720 0% /lib/init/rw
none 24027628 22204940 602152 98% /var/lib/ureadahead/debugfs
/dev/sda2 128321212 12963948 108838892 11% /home

sudo du -sc * from the / dir yields:
6852 bin
55076 boot
0 cdrom
332 dev
52 drivers
17932 etc
du: cannot access `home/menggr/.gvfs': Permission denied
12771740 home
0 initrd.img
0 initrd.img.old
383696 lib
16 lost+found
17630604 media
4 mnt
4 opt
du: cannot access `proc/3189/task/3189/fd/4': No such file or directory
du: cannot access `proc/3189/task/3189/fdinfo/4': No such file or directory
du: cannot access `proc/3189/fd/4': No such file or directory
du: cannot access `proc/3189/fdinfo/4': No such file or directory
du: cannot access `proc/3190': No such file or directory
du: cannot access `proc/3192': No such file or directory
du: cannot access `proc/3193': No such file or directory
0 proc
392 root
8512 sbin
4 selinux
200 srv
0 sys
136 tmp
2842812 usr
1082940 var
0 vmlinuz
0 vmlinuz.old
34801304 total

From the df we can see that the /dev/sda2 partition that has /home mounted is using 12,963,948kb. This is reasonably consistent with the value reported by du, which is 12,771,740kb. But for /dev/sda1, which has everything else, df reports it is using 22,204,940kb and is 98% full; and debugfs mirrors that. But if we look at what du reports for everything besides /home (we also ignore media too because that is just an external disk) it totals out to 4,398,960kb which isn't even close to 98%. I spent most of the day trying to find what is going on here but have failed. I also don't know what the /var/lib/ureadahead/debugfs is all about despite reading several postings about it. When I boot my server it is complaining that the root directory is almost full, but I'm not sure if I should believe it or not. Any suggestions on what I can do? Thanks in advance!
Old 02-24-2010, 12:48 PM   #2
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Registered: Oct 2004
Distribution: Fedora Core 4, 12, 13, 14, 15, 17
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Read this post :

Apparently ureadahead is something that preloads files so the system boots faster.

But the output in df shouldn't include debugfs, it's a bug in df that has already been reported.

You are not running out of space.

Also, try using
du -schx
from /

(you don't need a wildcard)

Last edited by smoker; 02-24-2010 at 12:58 PM.
1 members found this post helpful.
Old 02-24-2010, 08:42 PM   #3
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Registered: Oct 2008
Posts: 19

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This for the link smoker. I've also gotten the /var/lib/ureadahead/debugfs entry to go away. I guess that happened after I rebooted with a previous kernel and ran a few fsck's. I'm now back to the most recent kernel. The fsck's did find some missing inode problems. I don't really know what part of what I did helped to resolve this problem, but I seem to be operating normally again.


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