mdadm raid1 显示已移除的磁盘

mdadm raid1 显示已移除的磁盘

我有一台专用服务器,由两块硬盘组成,每块硬盘有 5 个分区。

NAME    MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINTS
sda       8:0    0   1.8T  0 disk  
├─sda1    8:1    0     1M  0 part  
├─sda2    8:2    0   488M  0 part  /boot/efi
├─sda3    8:3    0   7.6G  0 part  
│ └─md0   9:0    0  15.3G  0 raid0 [SWAP]
├─sda4    8:4    0   977M  0 part  
└─sda5    8:5    0   1.8T  0 part  
sdb       8:16   0   1.8T  0 disk  
├─sdb1    8:17   0     1M  0 part  
├─sdb2    8:18   0   488M  0 part  
├─sdb3    8:19   0   7.6G  0 part  
│ └─md0   9:0    0  15.3G  0 raid0 [SWAP]
├─sdb4    8:20   0   977M  0 part  
│ └─md1   9:1    0 976.4M  0 raid1 /boot
└─sdb5    8:21   0   1.8T  0 part  
  └─md2   9:2    0   1.8T  0 raid1 /

由于无法识别磁盘而导致服务器无法重新启动后,检查我的 raid 配置时,我注意到 /dev/md2(似乎包含操作系统和所有数据)有一个磁盘已被移除,并且只显示 /dev/sdb5 为活动磁盘,第二个磁盘已被移除。

sudo mdadm --detail /dev/md2
/dev/md2:
           Version : 1.2
     Creation Time : Fri Jan  3 09:18:45 2020
        Raid Level : raid1
        Array Size : 1943880704 (1853.83 GiB 1990.53 GB)
     Used Dev Size : 1943880704 (1853.83 GiB 1990.53 GB)
      Raid Devices : 2
     Total Devices : 1
       Persistence : Superblock is persistent

     Intent Bitmap : Internal

       Update Time : Sun Sep 17 09:11:34 2023
             State : active, degraded 
    Active Devices : 1
   Working Devices : 1
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : bitmap

              Name : srv10135:2  (local to host srv10135)
              UUID : 2dcfef18:2714aa4a:7a708454:42eb8813
            Events : 219026

    Number   Major   Minor   RaidDevice State
       -       0        0        0      removed
       1       8       21        1      active sync   /dev/sdb5

检查两个分区(/dev/sda5 和 /dev/sdb5),我发现它们都属于同一个 RAID,并且被标记为活动状态

sudo mdadm --examine /dev/sda5
/dev/sda5:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
     Array UUID : 2dcfef18:2714aa4a:7a708454:42eb8813
           Name : srv10135:2  (local to host srv10135)
  Creation Time : Fri Jan  3 09:18:45 2020
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 3887761408 sectors (1853.83 GiB 1990.53 GB)
     Array Size : 1943880704 KiB (1853.83 GiB 1990.53 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
   Unused Space : before=262056 sectors, after=0 sectors
          State : active
    Device UUID : d2b34f96:e2f0a43b:d3e85f43:b8cf7ea4

Internal Bitmap : 8 sectors from superblock
    Update Time : Sat Sep 16 11:19:49 2023
  Bad Block Log : 512 entries available at offset 72 sectors
       Checksum : 27e920f0 - correct
         Events : 189131


   Device Role : Active device 0
   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)

sudo mdadm --examine /dev/sdb5
/dev/sdb5:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
     Array UUID : 2dcfef18:2714aa4a:7a708454:42eb8813
           Name : srv10135:2  (local to host srv10135)
  Creation Time : Fri Jan  3 09:18:45 2020
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 3887761408 sectors (1853.83 GiB 1990.53 GB)
     Array Size : 1943880704 KiB (1853.83 GiB 1990.53 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
   Unused Space : before=262056 sectors, after=0 sectors
          State : active
    Device UUID : 78918ed5:59a78605:df84fcf7:91ba926b

Internal Bitmap : 8 sectors from superblock
    Update Time : Sun Sep 17 09:16:06 2023
  Bad Block Log : 512 entries available at offset 72 sectors
       Checksum : acbce60c - correct
         Events : 219236


   Device Role : Active device 1
   Array State : .A ('A' == active, '.' == missing, 'R' == replacing)

现在我想知道mdadm --detail /dev/md2RAID 成员是否显示了错误的信息,或者 /dev/sda5 是否真的在 RAID 中丢失,以及是否可以安全地将其重新添加到 RAID 中

答案1

一般来说,/proc/mdstat显示真实的当前 RAID 状态。

sda5确实从 RAID 阵列中缺失:请注意其事件计数远低于sdb5。还请注意如何sdb5查看阵列状态.A- 即:第一个磁盘显示为丢失。

您需要重新添加sda5到阵列,发出类似于mdadm /dev/md2 -a /dev/sda5(三重检查此命令发行它)。

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