mdadm raid6 數組在增長後報告 df -h 中的大小不正確

我最近在 Fedora 18 中使用第六張光碟增加了一個 5x 3tb mdadm raid6 陣列（8tb），經過完全重建和檢查，“mdadm –detail /dev/md127”返回以下內容：

       Version : 1.2
 Creation Time : Sun Feb 10 22:01:32 2013
    Raid Level : raid6
    Array Size : 11720534016 (11177.57 GiB 12001.83 GB)
 Used Dev Size : 2930133504 (2794.39 GiB 3000.46 GB)
  Raid Devices : 6
 Total Devices : 6
   Persistence : Superblock is persistent
 Intent Bitmap : Internal
   Update Time : Sun Jul 21 17:31:32 2013
         State : active 
Active Devices : 6
Working Devices : 6
Failed Devices : 0
 Spare Devices : 0
        Layout : left-symmetric
    Chunk Size : 512K
          Name : ubuntu:tercore
          UUID : f52477e1:ded036fa:95632986:dcb84e51
        Events : 326236
   Number   Major   Minor   RaidDevice State
      0       8        1        0      active sync   /dev/sda1
      1       8       17        1      active sync   /dev/sdb1
      2       8       33        2      active sync   /dev/sdc1
      4       8       49        3      active sync   /dev/sdd1
      5       8       80        4      active sync   /dev/sdf
      6       8       64        5      active sync   /dev/sde

都好。

然後我執行“cat /proc/mdstat”，它返回以下內容：

Personalities : [raid6] [raid5] [raid4] 
md127 : active raid6 sde[6] sdf[5] sda1[0] sdb1[1] sdd1[4] sdc1[2]
     11720534016 blocks super 1.2 level 6, 512k chunk, algorithm 2 [6/6] [UUUUUU]
     bitmap: 0/22 pages [0KB], 65536KB chunk
unused devices: <none>

也很好。

但是，當執行“df -h”時，我得到以下錯誤報告舊的 RAID 容量：

Filesystem                           Size  Used Avail Use% Mounted on
devtmpfs                             922M     0  922M   0% /dev
tmpfs                                939M  140K  939M   1% /dev/shm
tmpfs                                939M  2.6M  936M   1% /run
tmpfs                                939M     0  939M   0% /sys/fs/cgroup
/dev/mapper/fedora_faufnir--hp-root   26G  7.2G   17G  30% /
tmpfs                                939M   20K  939M   1% /tmp
/dev/sdg1                            485M  108M  352M  24% /boot
/dev/md127                           8.2T  7.6T  135G  99% /home/teracore

誰能幫我解決這個不匹配？這自然也會導致 samba 通過我的 Windows 筆記型電腦報告不正確的陣列容量。

提前謝謝了！將要。

我想你忘記執行 resize2fs 命令

# mdadm --detail /dev/md0
/dev/md0:
       Version : 0.90
 Creation Time : Sun Jul 21 23:50:49 2013
    Raid Level : raid6
    Array Size : 62914368 (60.00 GiB 64.42 GB)
 Used Dev Size : 20971456 (20.00 GiB 21.47 GB)
  Raid Devices : 5
 Total Devices : 5
Preferred Minor : 0
   Persistence : Superblock is persistent

   Update Time : Mon Jul 22 00:04:43 2013
         State : clean
Active Devices : 5
Working Devices : 5
Failed Devices : 0
 Spare Devices : 0

    Chunk Size : 64K

          UUID : c0a5733d:46d5dd5e:b24ac321:6c547228
        Events : 0.13992

   Number   Major   Minor   RaidDevice State
      0       8       16        0      active sync   /dev/sdb
      1       8       32        1      active sync   /dev/sdc
      2       8       48        2      active sync   /dev/sdd
      3       8       64        3      active sync   /dev/sde
      4       8       80        4      active sync   /dev/sdf

# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              39G  1.6G   35G   5% /
/dev/sda1             494M   23M  446M   5% /boot
tmpfs                 500M     0  500M   0% /dev/shm
/dev/md0               60G  188M   59G   1% /raid6

# resize2fs /dev/md0
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/md0 is mounted on /raid6; on-line resizing required
Performing an on-line resize of /dev/md0 to 20971456 (4k) blocks.
The filesystem on /dev/md0 is now 20971456 blocks long.

# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              39G  1.6G   35G   5% /
/dev/sda1             494M   23M  446M   5% /boot
tmpfs                 500M     0  500M   0% /dev/shm
/dev/md0               79G  192M   79G   1% /raid6

# mdadm --detail /dev/md0
/dev/md0:
       Version : 0.90
 Creation Time : Sun Jul 21 23:50:49 2013
    Raid Level : raid6
    Array Size : 83885824 (80.00 GiB 85.90 GB)
 Used Dev Size : 20971456 (20.00 GiB 21.47 GB)
  Raid Devices : 6
 Total Devices : 6
Preferred Minor : 0
   Persistence : Superblock is persistent

   Update Time : Mon Jul 22 00:04:43 2013
         State : clean
Active Devices : 6
Working Devices : 6
Failed Devices : 0
 Spare Devices : 0

    Chunk Size : 64K

          UUID : c0a5733d:46d5dd5e:b24ac321:6c547228
        Events : 0.13992

   Number   Major   Minor   RaidDevice State
      0       8       16        0      active sync   /dev/sdb
      1       8       32        1      active sync   /dev/sdc
      2       8       48        2      active sync   /dev/sdd
      3       8       64        3      active sync   /dev/sde
      4       8       80        4      active sync   /dev/sdf
      5       8       96        5      active sync   /dev/sdg

PS 我會建議在調整大小操作之前解除安裝 /dev/md127

引用自：https://serverfault.com/questions/525130