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Linux上使用mdadm配置RAID磁盘阵列

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异常和恢复流程

Problem 1: harddisk is removed

  1. 首先通过sudo mdadm -D /dev/md0 可以看到有两块disk显示removed
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/dev/md0:
    Version : 1.2
     Creation Time : Thu Jan  2 15:23:16 2020
        Raid Level : raid10
        Array Size : 7813772288 (7451.79 GiB 8001.30 GB)
     Used Dev Size : 3906886144 (3725.90 GiB 4000.65 GB)
      Raid Devices : 4
     Total Devices : 2
       Persistence : Superblock is persistent

     Intent Bitmap : Internal

       Update Time : Tue Feb 18 20:55:04 2020
             State : clean, degraded
    Active Devices : 2
   Working Devices : 2
    Failed Devices : 0
     Spare Devices : 0

            Layout : near=2
        Chunk Size : 512K

Consistency Policy : bitmap

    Number   Major   Minor   RaidDevice State
       -       0        0        0      removed
       1       8       48        1      active sync set-B
       -       0        0        2      removed
       4       8       80        3      active sync set-B
  1. sudo fdisk -l 查看所有硬盘, 找到是哪些硬盘，例如/dev/sdc, /dev/sde没有添加上
  2. sudo mdadm --re-add /dev/md0 /dev/sdc 重新添加硬盘进raid，添加成功会显示is added
  3. 此时再 sudo mdadm -D /dev/md0 则会显示rebuilding
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    Consistency Policy : bitmap

        Rebuild Status : 99% complete

        Number   Major   Minor   RaidDevice State
           0       8       32        0      spare rebuilding   /dev/sdc
           1       8       48        1      active sync set-B
           2       8       96        2      spare rebuilding   /dev/sdg
           4       8       80        3      active sync set-B
  4. 可以通过cat /proc/mdadm 查看状态