Strange problem...
Why i have full / partition used, but it's not really used?
Fast info:
xwing ~ # df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 16G 15G 75M 100% /
/dev/root 16G 15G 75M 100% /
devtmpfs 5,9G 0 5,9G 0% /dev
tmpfs 5,9G 552K 5,9G 1% /run
rc-svcdir 1,0M 72K 952K 8% /lib64/rc/init.d
cgroup_root 10M 0 10M 0% /sys/fs/cgroup
shm 5,9G 0 5,9G 0% /dev/shm
cachedir 4,0M 4,0K 4,0M 1% /lib64/splash/cache
/dev/sda1 124M 43M 76M 36% /boot
/dev/sda5 63G 25G 36G 42% /home
/dev/sda6 483G 147G 312G 33% /mnt/data
tmpfs 8,0G 0 8,0G 0% /var/tmp/portage
Maybe i-nodes? Noo...
xwing ~ # df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
rootfs 1048576 548459 500117 53% /
/dev/root 1048576 548459 500117 53% /
devtmpfs 1525561 517 1525044 1% /dev
tmpfs 1525918 374 1525544 1% /run
rc-svcdir 1525918 61 1525857 1% /lib64/rc/init.d
cgroup_root 1525918 5 1525913 1% /sys/fs/cgroup
shm 1525918 1 1525917 1% /dev/shm
cachedir 1525918 2 1525916 1% /lib64/splash/cache
/dev/sda1 32768 314 32454 1% /boot
/dev/sda5 4194304 145765 4048539 4% /home
/dev/sda6 32153600 11325 32142275 1% /mnt/data
tmpfs 1525918 1 1525917 1% /var/tmp/portage
But:
xwing ~ # du -sxh /
8,3G /
Maybe i have something broken in mount? (but anyway, notice i used du with -x which calculates files ONLY from / filesystem...)
/spaces added by me for better readibility/
xwing ~ # mount
rootfs on / type rootfs (rw)
/dev/root on / type ext4 (rw,noatime,data=ordered)
devtmpfs on /dev type devtmpfs (rw,relatime,size=6102244k,nr_inodes=1525561,mode=755)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
rc-svcdir on /lib64/rc/init.d type tmpfs (rw,nosuid,nodev,noexec,relatime,size=1024k,mode=755)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
cgroup_root on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,relatime,size=10240k,mode=755)
cpuset on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cpu on /sys/fs/cgroup/cpu type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
cpuacct on /sys/fs/cgroup/cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct)
freezer on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620)
shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime)
cachedir on /lib64/splash/cache type tmpfs (rw,nosuid,nodev,noexec,noatime,size=4096k,mode=755)
/dev/sda1 on /boot type ext2 (rw,noatime)
/dev/sda5 on /home type ext4 (rw,noatime)
/dev/sda6 on /mnt/data type ext4 (rw,noatime)
tmpfs on /var/tmp/portage type tmpfs (rw,size=8G)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
Kernel:
morsik@xwing ~ $ uname -a
Linux xwing 3.6.2-gentooxwing #8 SMP Sun Oct 21 21:36:53 CEST 2012 x86_64 Intel(R) Core(TM) i7-3610QM CPU @ 2.30GHz GenuineIntel GNU/Linux
Really... I'm out of possible ideas about it.
What i tried:
- check if there are some fd still open after rm -rf /usr/portage/distfiles/*
- sync
- reboot
- fsck
As always i found solution after asking for help (-;
Mounting (as Luke404 said) / partition somewhere else and doing du -sh /mnt/something told there's 15G of data, so the same like in df.
What was the problem?
mount!
I created /home partition later, added to /etc/fstab, I copied files from /home (on / partition) to /home (on /home partition) but i FORGOT to remove files from /home at / partition.
So I still had my old files on /home (on / partition).
But why du -sxh told me 8G? Easy...
-x forces to not check different mountpoints, so... it didn't checked /home while it was mounted. And there was my missing /home.
Thanks to Luke404 and pidpawel who helped me on IRC.
After writing this EDIT section i saw answers here, and Scrivener got point here!
Stupid problems are stupid (-;
Answer
This kind of problem is always really fun.
My guess? You have files underneath one of your mountpoints. What does that mean? Well, du -sh will go by hand through all of the files that it can find.
Let's say I have a directory, A. If I dump a bunch of files into A, and then mount, say, /dev/sdb on top of A, df -h will say I have a bunch of files that du won't be able to find!
This happens most often with mountpoints that mount and umount regularly, like USB drives, network drives, etc. It's much rarer to see it when the mounts happen automatically during boot, since the window for it to occur is so much smaller.
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