Linux 디스크 남은 공간 오류 - 30GB가 사라졌습니다.

좋은 아침입니다. 백업 머신에 "사소한" 문제가 있습니다. 공간의 96%가 사용된 것으로 감지되어 백업을 수행할 수 없습니다. 그러나 그것은 진실이 아니다.

실제 머신에서 몇 가지 명령을 시작했고 여기에 출력이 표시됩니다.

ubuntu@BACKUP:~$ sudo df -h
Filesystem                           Size  Used Avail Use% Mounted on
udev                                 992M     0  992M   0% /dev
tmpfs                                200M   21M  180M  11% /run
/dev/xvda1                            20G  4.8G   15G  25% /
tmpfs                               1000M     0 1000M   0% /dev/shm
tmpfs                                5.0M     0  5.0M   0% /run/lock
tmpfs                               1000M     0 1000M   0% /sys/fs/cgroup
/dev/mapper/vg_data-lv_data_backup   640G  580G   30G  96% /data/backup
/dev/mapper/vg_data-lv_data_archive  640G   49G  559G   9% /mnt/lv_data_archive
tmpfs                                200M     0  200M   0% /run/user/1000

보시다시피,/dev/mapper/vg_data-lv_data_backup30GB가 사라졌습니다. 나도 알아 이게외부 4루트 명령을 위해 5%의 공간을 분할하고 예약합니다. 하지만 이것이 이 오류에 대한 공간을 정당화하지는 않습니다...

다른 명령은 다음과 같습니다.

root@BACKUP:/data# du -h -d1 /data/backup
16K /data/backup/lost+found
531G    /data/backup/BackupPC
50G /data/backup/DumpDB
580G    /data/backup

---

ubuntu@BACKUP:~$ sudo lsof +L1 | numfmt --field=7 --to=iec --invalid='ignore'
    COMMAND    PID     USER  FD   TYPE DEVICE SIZE/OFF NLINK  NODE NAME
    systemd-j  388     root txt    REG  202,1     319K     0 52456 /lib/systemd/systemd-journald (deleted)
    dhclient  1010     root txt    REG  202,1     476K     0  4269 /sbin/dhclient (deleted)
    lxcfs     1202     root txt    REG  202,1      19K     0 24454 /usr/bin/lxcfs (deleted)
    systemd-l 1233     root txt    REG  202,1     605K     0 52482 /lib/systemd/systemd-logind (deleted)
    agetty    1476     root txt    REG  202,1      44K     0  4308 /sbin/agetty (deleted)
    agetty    1482     root txt    REG  202,1      44K     0  4308 /sbin/agetty (deleted)
    BackupPC  1625 backuppc txt    REG  202,1     1.9M     0  6550 /usr/bin/perl (deleted)

---

root@BACKUP:/data# dumpe2fs -h /dev/mapper/vg_data-lv_data_backup 
dumpe2fs 1.42.13 (17-May-2015)
Filesystem volume name:   <none>
Last mounted on:          /data/backup
Filesystem UUID:          8f2689b8-6ed0-47d2-833c-904097eb6a34
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash 
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              42598400
Block count:              170393600
Reserved block count:     7869498
Free blocks:              57647530
Free inodes:              40094191
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      983
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Tue Aug 22 12:04:28 2017
Last mount time:          Fri Dec 15 12:20:05 2017
Last write time:          Fri Dec 15 12:20:05 2017
Mount count:              16
Maximum mount count:      -1
Last checked:             Tue Aug 22 12:04:28 2017
Check interval:           0 (<none>)
Lifetime writes:          5450 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:           256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      fd48ebc6-99be-468a-8c2d-3aa600ce2412
Journal backup:           inode blocks
Journal features:         journal_incompat_revoke
Journal size:             128M
Journal length:           32768
Journal sequence:         0x00011b23
Journal start:            30397

감사해요