linux -/dev/mapper/fedora-root 满到96%，但是好像隐藏了超过50%的权重

Question

事实:

# ls -lh /
total 80K
drwxrwxrwx.   5 root root 4.0K May 26  2015 backUp
lrwxrwxrwx.   1 root root    7 Aug 16  2014 bin -> usr/bin
dr-xr-xr-x.   4 root root 3.0K Jan  5 14:13 boot
drwxrwxrwx.   6 root root 4.0K Jul 16 12:01 data_1
drwxrwxrwx.   5 root root 4.0K Jun 10  2015 data_2
drwxr-xr-x.  20 root root 3.6K Jan  6 09:29 dev
drwxr-xr-x. 160 root root  12K Jan  6 10:28 etc
drwxr-xr-x.   4 root root 4.0K Aug 16  2014 home
drwxr-xr-x.   2 root root    0 Jan  6 09:56 hosts
lrwxrwxrwx.   1 root root    7 Aug 16  2014 lib -> usr/lib
lrwxrwxrwx.   1 root root    9 Aug 16  2014 lib64 -> usr/lib64
drwx------.   2 root root  16K Nov  4  2014 lost+found
drwxr-xr-x.   2 root root 4.0K Aug 16  2014 media
drwxr-xr-x.   2 root root 4.0K Aug 16  2014 mnt
drwxr-xr-x.   4 root root 4.0K Jul 17 17:43 opt
dr-xr-xr-x. 295 root root    0 Jan  6 10:29 proc
dr-xr-x---.  25 root root 4.0K Jan  6 10:51 root
drwxr-xr-x.  46 root root 1.4K Jan  6 10:46 run
lrwxrwxrwx.   1 root root    8 Aug 16  2014 sbin -> usr/sbin
drwxr-xr-x.   2 root root 4.0K Aug 16  2014 srv
dr-xr-xr-x.  13 root root    0 Jan  6 09:29 sys
drwxr-xr-x.   2 root root 4.0K Jul 15 16:25 sysroot
drwxrwxrwt.  14 root root  300 Jan  6 10:56 tmp
drwxr-xr-x.  14 root root 4.0K Sep 14 16:57 usr
drwxr-xr-x.  20 root root 4.0K Jan  6 10:29 var
# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                  32G     0   32G   0% /dev
tmpfs                     32G  308K   32G   1% /dev/shm
tmpfs                     32G  1.5M   32G   1% /run
tmpfs                     32G     0   32G   0% /sys/fs/cgroup
/dev/mapper/fedora-root   50G   45G  2.3G  96% /
tmpfs                     32G  328K   32G   1% /tmp
/dev/sda3                477M  147M  301M  33% /boot
/dev/sdb2                917G  288G  583G  34% /data_2
/dev/sdb1                917G   20G  852G   3% /data_1
/dev/mapper/fedora-home  160G   13G  140G   9% /home
/dev/sdc1                2.7T  383G  2.2T  15% /backUp
tmpfs                    6.3G  8.0K  6.3G   1% /run/user/42
tmpfs                    6.3G   36K  6.3G   1% /run/user/1385
# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda5
  VG Name               fedora
  PV Size               235.95 GiB / not usable 0   
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              60402
  Free PE               0
  Allocated PE          60402
  PV UUID               8oXP7e-NSTf-weml-tWWg-E64b-mjmq-nzcf19
# lvdisplay
  --- Logical volume ---
  LV Path                /dev/fedora/swap
  LV Name                swap
  VG Name                fedora
  LV UUID                Ego2By-VwgS-bIic-Wwna-D5u8-4JDi-9gVAez
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2014-11-04 12:35:40 +0100
  LV Status              available
  # open                 2
  LV Size                23.85 GiB
  Current LE             6105
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Path                /dev/fedora/home
  LV Name                home
  VG Name                fedora
  LV UUID                uPHuWm-rdMX-AOt9-MJWP-5Qgs-a83u-Asqktc
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2014-11-04 12:35:40 +0100
  LV Status              available
  # open                 1
  LV Size                162.10 GiB
  Current LE             41497
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2
   
  --- Logical volume ---
  LV Path                /dev/fedora/root
  LV Name                root
  VG Name                fedora
  LV UUID                PQG3IH-2lt3-PCyq-c6by-fSxL-2a2L-Hlr87V
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2014-11-04 12:35:46 +0100
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
# du -sh /*
382G    /backUp
0   /bin
145M    /boot
20G /data_1
288G    /data_2
308K    /dev
42M /etc
12G /home
0   /hosts
0   /lib
0   /lib64
16K /lost+found
4.0K    /media
4.0K    /mnt
137M    /opt
du: cannot access ‘/proc/13761/task/13761/fd/3’: No such file or directory
du: cannot access ‘/proc/13761/task/13761/fdinfo/3’: No such file or directory
du: cannot access ‘/proc/13761/fd/3’: No such file or directory
du: cannot access ‘/proc/13761/fdinfo/3’: No such file or directory
0   /proc
35M /root
du: cannot access ‘/run/user/1385/gvfs’: Permission denied
du: cannot access ‘/run/user/42/gvfs’: Permission denied
1.5M    /run
0   /sbin
4.0K    /srv
0   /sys
4.0K    /sysroot
4.0K    /tmp
9.3G    /usr
2.9G    /var

因此，根据这些结果，/backUp、/data_1 和/data_2 被挂载到两个磁盘(分别是/dev/sdc 和/dev/sdb)，而系统挂载到另一个磁盘(/dev/sda)中，并带有LVM .

• df -h 命令返回/已满 96%:

/dev/mapper/fedora-root 50G 45G 2.3G 96% /

• 但是，如果我们对/执行 du -sh 的返回，我们会观察到更重的目录是/usr 和/var，总重量大约为 13G(/backUp ,/data_1 和/data_2 在其他磁盘上，/home 对应于/dev/mapper/fedora-home):

9.3G /usr

2.9G /var

因此，看来 du 命令中的/权重接近 13G，而 df 命令中的/权重接近 45G ... 所以我在黑洞中有 32G。 .. 我没有看到错误，请不要犹豫，提出建议来解决这个非常奇怪的事情!我确定我错过了什么......

Answer 1

为了一件很容易的事，我浪费了很多时间。 正如 mattdm 在评论中所建议的那样，在这种情况下，更简单快捷的尝试是卸载所有卷(当然，系统除外)并检查挂载点中是否再次存在数据。问题可能出在每天自动备份的情况下(就像我一样)。如果由于未知原因相应的磁盘被拔下(或其他)，备份将在根文件(安装点)上完成。如果磁盘随后被挂载(同样是出于未知原因 - 这个问题的日期对应于圣诞节假期:-))，根文件上的相应数据将被遮盖 !!!! 对于长版 see here . 希望这会有所帮助。